HomeMy WebLinkAbout5.2ITEM 5.2
TOWN OF LOS ALTOS HILLS May 9, 2013
Staff Report. to the Planning Commission
SUBJECT: REVIEW 'OF.. LIGHTED IN -PAVEMENT WARNING -SYSTEM AND
ELECTRONIC DRIVER FEEDBACK SIGN FOR ARASTRADERO TRAIL
PROJECT
FROM: Richard Chiu, City Engineer 7-.2- C
RECOMMENDATION: That the Planning Commission:
Review and make recommendations to City Council on the lighted in -pavement warning
system and electronic driver feedback sign for the Arastradero Trail Project.
DISCUSSION
On April 189'..2,0.13 the City Council directed staff to present the lighted in -pavement warning
system to the Planning Commission for review. The proposed' crosswalk is to facilitate
crossing Page Mill Road at Baleri Ranch Road. Based on a traffic' study peifori ied• by, Fe&
& Peers, the recommendation fora c=ossiig at this location requires ai enhanced crosswalk
design which included ai -Tashing.beacon system, a flashing sign, or an in -pavement warning
light system. These systems are designed to be activated only when in use. Activation can be
automatic with °bollards'or`manually activated with push buttons. Another option would be to
delete the crosswalk at this location andforegothe need to.have any lighted systems — .--- -- .----
The electronic driver feedback sign was a Town project that was incorporated into the
Arastradero Trail project. In April of 2011, residents on Stirrup Way indicated that there was
a site distance issue at the intersection of Stirrup and Arastradero. The Town hired A:'traffic
consultant to study the intersection and the recommendation was to install an electronic
driver feedback sign. This issue was discussed at several meetings of the Traffic Safety
Committee and on February 28, 2012, the Traffic Safety Committee voted to approve the
installation of the electronic driver feedback sign. With the Arastradero Trail Project
pending, it made sense to incorporate into the project.
Staff is available to answer any questions of the Planning Commission or:public,
ATTACHMENTS'
1. Traffic Consultant report for Page Mill and Baleri Ranch Road
2: Photos of lighted in -pavement warning system -
3. Traffic Consultant report for Stirrup Way and Arastradero Road
4. Photos of electronic driver feedback sign
5. February 28,2012 Traffic Safety Committee Meeting Minutes
ATTACHMENT 1
FEHR. &_ PEEM
TRANSPORTATION CONSULTANTS
MEMORANDUM
TO: Jim Inglis, Stanford Real Estate
FROM: Robert H. Eckols, P.E. ;
Angela R. Obeso; P.E.
DATE: April 4, 2007
SUBJECT: Stanford Trail: Project: -Pedestrian Crossing Analysis & Conceptual
Design for Page Mill Road and Arastradpro Road/Baleri Ranch Road
_..... .. SJO6-843
Planning and design of the Stanford University trail system is included as a part of Stanford
University's General .Use Permit (GUP) update. The. analysis and design of the proposed
pedestrian crossing at Page Mi(I Road and Arastradero Road is part of the trail system work.
This memorandum summarizes the data collection' and Fehr. 8� Peers' recommendations
regarding -the design of the pedestrian -crossing at the intersection of -Page -Mill Road and
Arastradero Road/Baleri Ranch Road..
Page Mill Road extends from the Santa Cruz
hills on the west to EI Camino Rei -Lon the east
where it turns into* Oregon Expressway, "which
extends east to Highway 101.. Arastradero
Road .has two distinct.. sections: one section SO
extends between Alpine Road and Page Mill
Road, and the other extends ' from Page Mill .
Road to EI Camino Real.. At EI -';Camino, Real,
Arastradero Road turns into Charleston :Road. a Arft°ro
There are two intersections formed -by .e
Arastradero Road at Page Mill Road: one just
west of Highway 280, and one'approximately�`�
500 feet south on Page Mill Road, as shown in ;
this figure. The proposed pedestrian crossing
would be located at the _. western . most
intersection formed by Arastradero Road, Baler!
Ranch Road, and Page Mill Road:
Existing Volumes
Twenty -four-hour, seven-day directional, counts _were collected from Friday, March 2, 2007,
through Thursday, March 8, 2007, for each of the four legs of the project intersection. Speed
counts were also collected on Page Mill Road north. and south of the intersection. Table 1
summarizes the daily traffic volumes and average volumes for each day by ,location.
Detailed summaries and charts of the'se.trafk counts are provided as,an attachment to this
document.
160 W. Santa Clara Street, Suite 675 San Jose, CA 95110 (408)M-1700 Fax (408) 278-1717
www.fehrandpeers.com
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April 3, 2007
Page 3 of 4
FEH[t t FEEu
raresvoetwrtoR toesuir�a3s
The average daily traffic into the intersection for all seven days. 1s.7,534 vehicles. Daily
volumes ranged from 6,900 to 7,900 vehicles. The typical weekday (3 -day) average is
slightly higher than the weekend average by approximately 200 vehicles. Traffic volumes on
the Page Mill Road and Arastradero Road' d'emonstrate'-typical commute patterns. There are
peaks in the traffic. volumes during the AM,periodfor northbound Page Mill Road north'of
Arastradero Road and: eastbound. Arastradero Road west of Page Mill Road;: corresponding
to theeastbound to northbound. leffAurning -movement. There are also peaks in the PM
period on both Page Mill: Road approaches and eastbound Arastradero Road.- Volumes on
Baled Ranch Road -are relatively balanced throughout the.day.
Existing Peak. Hours
Friday; March 2,. 2007; was the weekday with„the highest vehicular volume; the. refore,"it was
usedd to determine':the typical peak hour volumes:. Table 2 summarizesthe eight; highest
hours of the day based on the. total volume on all approaches of the project intersection.
Table 2
Peak Hour Volumes
Location ,
3:00
8:00
5:00
--4:00
2:00
12:00
7:00
11:00
PM
AM
'PM'.
PM
PM
' PM
AM - '
AM
EB Arastradero Rd
W/O Page Mill Rd
140
218
156
.146
118-
96
199
123
WB Baled Ranch.Rd
E/0Page Mill Rd
8
6
4
5
13
9
5
6
SB Page Mill Rd N/O
Arastradero Rd' -
315
242
-'288.
280-
261
" 305::
179
249
NB Page Mill Rd Sib
Arastradero Rd
190
'166
151'
.' ' 167167
141
156
146
Total
653
632
599
"-598
5591
5,51:1-539
524
Existing Speeds
Speed counts were collected on both legs of Page Mill Road at Arastradero Road/Baler!
Ranch Road. Table 3 presents the daily average 85th -percentile speeds. The overall
average 85th -percentile speed is 36 miles per -hour (mph). The majority of -vehicles are
traveling within. the 25-30 mph and 30-35 mph speed groups on all days, with traffic generally
traveling at somewhat slower speeds .on the weekends. Detailed summaries and charts of
these speed counts are pro_ vided as an attachment to this- document.- The- 85th -percentile
speeds of vehicles entering the intersection in the southbound direction is 35 mph, and the
85th -percentile speed of vehicles entering the intersection in the northbound direction is 37
mph.
Mr. Jim Inglis
April 3, 2007
Page 4 of 4 E E -H Li z FEERS
rAAMSPORTATr6a CONSO[rAXTS
Pedestrian Crosswalk Conceptual :Design
Exhibit 1 shows the existing conditions at the study intersection. The intersection is
controlled with stop signs on. the side streets. There are no crosswalks at the
intersection, but there are equestrian crossing signs located on Page Mill Road
approximately 250 feet in advance of the intersection. The posted speed limit north of the
intersection is 35 mph and the posted limit south of the intersection is 25 mph. -
Exhibit 2 shows a conceptual design for the pedestrian crosswalk based on our site visits
and the available traffic data. The major features of the design are as follows:
• Replacement of the equestrian crossing signs,.with pedestrian crossing signs
Addition of a high visibility4nternational crosswalk°om south' leg -of inteesectiorr
(across Page Mill Road) with handicapped accessible ramps
• Addition of a standard crosswalk on east leg of intersection (across Baleri Ranch
Road) with handicapped "accessible ramps
• Addition of pedestrian/equestrian activated flashing beacon at the Page Mill
Road crosswalk
• Addition of a street light at crosswalk to improve night time visibility
There is sufficient sight stopping distance at the intersection for an operating speed of 40
mph Oust over 300 feet in both directions). The flashing beacon located on the
Arastradero side of the street would effectively increase the sight stopping distance in the
northbound direction due to its location west of the intersection.
Table 3
Daily Average 85th Percentile Speeds
(mph)
Northbound Pa a Mill. .
Southbound Page Mill
N/O S/O N/O $/O
Arastradero Arastradero Arastradero Arastradero
Friday
March 2, 2007
`37.8
36.7
34.9.
36.9
Saturday
March 3, 2007
37.1
35.3
34.0
36.0
Sunday'
March 4, 2007
36.7.
34.9
33.1
35.3
Monday
March 5, 2007
36.7
36.9
34.4
36.7
Tuesday
March 6, 2007
36.7
36.7-..
34.7
36.9
Wednesday
. March 7, 2007.
36.7
36.7
34.9 _ .
36.7
Thursday
March .8,-2007
36.7
36.7
34.9
37.1
Pedestrian Crosswalk Conceptual :Design
Exhibit 1 shows the existing conditions at the study intersection. The intersection is
controlled with stop signs on. the side streets. There are no crosswalks at the
intersection, but there are equestrian crossing signs located on Page Mill Road
approximately 250 feet in advance of the intersection. The posted speed limit north of the
intersection is 35 mph and the posted limit south of the intersection is 25 mph. -
Exhibit 2 shows a conceptual design for the pedestrian crosswalk based on our site visits
and the available traffic data. The major features of the design are as follows:
• Replacement of the equestrian crossing signs,.with pedestrian crossing signs
Addition of a high visibility4nternational crosswalk°om south' leg -of inteesectiorr
(across Page Mill Road) with handicapped accessible ramps
• Addition of a standard crosswalk on east leg of intersection (across Baleri Ranch
Road) with handicapped "accessible ramps
• Addition of pedestrian/equestrian activated flashing beacon at the Page Mill
Road crosswalk
• Addition of a street light at crosswalk to improve night time visibility
There is sufficient sight stopping distance at the intersection for an operating speed of 40
mph Oust over 300 feet in both directions). The flashing beacon located on the
Arastradero side of the street would effectively increase the sight stopping distance in the
northbound direction due to its location west of the intersection.
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Direction:
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Monday, March' 5, 2007
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Saturday, March 3,-20
Direction:
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Monday, March 5, 2007
Tuesday,.March 6; 20g7
Wednesday, Marcli 7;'''2007
Thursday, March 6,'2007
Friday, March 2, 2007 i :,
Saturday, March 3, 2007
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Page MITI Road north of Arastradero Road
Direction:
Northbound
Hour Beginning
-
0:00.1:00.2:00.3:00 4:00 5:00 8:00.:7:00 8.00 9:00
10:00 11.00 12 -nn 1'smn 1a•nn 15.00 1a:nn 17.nn
- , , , , 18.00 19.00 2000 2100 22.00 23.00
Sunday, March 4, 2007.
16 A1
5
4
4..
5 : 19 44 73 144.
177
> 200.
236
222
227
252
323
284. 179
84
68'_
47
23
21
2668
Monday, March 5, 2007
10 1.
1
2
'5
28 76 381 376 241
213
214
199
184
222
304
310
234 175
75
47
35
17
12
3362
Tuesday, March 6, 2007
3 8
1,
0
3
18 81 :379'41.0,:,262
-231
204
209
222
249
286
•:. 290
273 217
109.
51
49
26
13
3594
Wednesday, March 7, 2007 •
-
C. 4
.6 .3
2•
.19 , 94365 ,389 267
.. 226:`
217
245
285
` 277
283.„
322
268' 206
105
52""
' 41
39
11
3730
Thursday, March 8; 2007
5 2-.
•- 3
3::;: 5
21 80 ..390.:388 273
:234
239
207
217'
305
320
330.
274-.-225
3794
:109
:.
.
70
27
13
Friday, March 2, 2007
4 2
3
1
8-.
21 71 343 372 256.,•
-250
244
217.
250
278
.310
292
.293 . ,-' 214
,:54
:77
54
69
35
3794
Saturday, March 3, 2007 '
27 11
8
.1
5
4 30' 60 155:22i".
274
252
261
221
282
282
311
:,270`. 194,`
,130.
124'
.92
.
80
78
43
3286
Direction:
Southbound .
Hour Beginning
0.00 1 002:00 3 00 4 00 5:00 8 00 :7:00 8:00 9 00 10:00 11 00 12:0n _1a•nn 1a•nn 15'n01.116:00[117:001:18:601 18'00 20 00 `21.00 22.00 23.00
Sunday, March 4, 2007 - .
28 . 13
10
9
4
A6 31 100 262,305
246 261:
326
354
309 291
307 .• 179 `:.170 1:09
86 61
`: 47
25
3539 -
Monday, March 5, 2007
14 5
4
-3-
5
25 66-.I 57 208' 180
189
194
204
` 211
.255
287
231,_..=30'5.
277
172
`111
99
•.: 61'
26:
3289
Tuesday, March 6 2007,
8 '9
.' 3
'2
4;
28 86--197 212 209
209
203
233
237
253
269
299.;,
331. 285
' 209
134
106
51
30
3607
Wednesday, March 7, 2007
10 9•,w
6
2
2
27 89 209-199 248
192
'235
235
249
„ 258
295
''275
331. 286
188
,
13668
63
25
3667
Thursday, March 8, 2007
'.11 -7 .
3
'3
7.
28 ' 88',212 255;:234
181
21.2
' 205
238
`'250
'287,
278 --332
' 288
177
127.
100
82
41
Friday, March 2, 200'
15` 3
6 ..8
3
25 69 .179, 242 204
218
249
305
-238''261
315
2$0-
28'8,.28'8.
-155
125
129
`85
57
.3646
3747
Saturday, March 3,' 2007
30 14 '
8.
6
2
26 44 105 156,266
293
350
328
331
354
289
303--,2
50 s 180113
95
98 .
-78
69
3788
Direction:
Both Directions^
.,
Hour Beginninga:nn
0.00 ,'1.00 2:00 3
00 :4:00 .5:00 8.00 7;00 8:00 9:00
40:00 11 c00 19:00113:091:14:00115•nn
<1 '1�:nn .da•nn ;.19:0n �n•nn 21.nn
Sunday, March 4, 2007
44 24..:.15'-
13 -
-&,.,21 50 7.,44;325 449 423 '
461 _
562
576
536
543
630,
463 349
193 154
108
70
46
6207
Monday, March 5; 2007
24 6
5
5,:-,10
53. 142.. 538 '584 421.
402.
408
403
395
`x,477
591:'
.
541:
539 .452
247
15$.,-134
78
38
665.1
Tuesday, March 6, 2007
11 17
4
2
7.
46 167 576 622 471
440
A07
442
459 502!-555
589
604 502
318
155
` 77
7201
Wednesday, March 7, 2007
14 13' '12
5
4
46 183'1574: 588 515
418
452
480
534
-535.578
597
599 :;492..
293
,:-185
-188
139
102
.43
36
7397
Thursday, March 8,2007
16 9. .0
6
6.
12
49 168'602 643 507
415
451.
412
.455
555
607`
608
,
606 `513.
286
181;;.
170
109
54
7440
Friday, March 2, 2007
1.9., 5'
9
9
11
46 140 522 614 460`•
468
493
522 -
-488
539:t:625
572
581 502;
:285
.202`
;183
754
92
7541
Saturday, March'3, 2007
57 '25
16
7
7
30'-' 74:165 311 487'
567
602
589
552
636
571-
614'
520 ;374
237
.187
178
156
112
7074
' I ��.ys I � � i � J - :�I J I , in, it�y r, 1 9 '1 C�,tt��+k4��'9 a��5�15e4yyi+ �� i .�q • A, � f � ,j,: � a '
•. d Ji..
.._.iii •� �� ?'.. uyV_ 17 Y7. .A�.✓,41... 1 .:1! z W a � `1 ; + i
A•ra;-! i 1111 1T •��
- _•� `�_��R�''J: �r'`v✓'��ti'� T'�,''
t.✓�/ _ R�� jI � �} i'.'�-r`^7"� f _.4.n' el 1��,a�� a� � !\`�\L�` _ ' y t
700
600
500
0
400
(D
d)
300
200
.100
0
.
-61 Kp . Qj Al -0p sp .(Zp qp 00' 00 00I .4zp (p.00 qp 00p (p (p
,Z), N' ry 'S. tx- 4p ro lb- OV NIZV. -NN.' x,.bi- .6- r6- ON, x%06 -,`O -
Hour Beginning
Northbound Page Mill Road S/O Aras . tradero Road
Hourly Volumes
—6—Sun
--*—Mon
Tues
Wed
Thurs
Fri
—+—Sat
+J r ,r rrly '� c � k
i' - -'r'.a'r
I
ryr rlC •�+-) r r r+y^,-r ^(-Yr''.t-n�;,
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• t �• i a: f r .; Y i.
9 .•
f
�^�7f��
L
ma;
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.^i 1. Y +y r^
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;r rcSit�}hctryk• ir'n�''n cin if �`.3f". �+ f t,.^i w•trh�IL t''kl`�
� ir"lriry x"i'�4 i'"�•S*•`'.c"rrrT r"F'r"�fr* C
f1F,, �` n� c"i^•f t`�K" ^5� $4firc`ii.�i4l"C i
{
Page Mill Road south of Arastradero Road
Direction: Northbound i
sunaay,Marcn 4, ZUU7
14
11
3
3
2
4
11
.28
51
B3
114
130
1B7
182
1B5
207
250
172
106
60
52
39
14
15
1912
Monday, March 5, 2007
7
1
1
3
3
14
40
180
155
122
120
121
117
107
;126
159'
162
117
82
39
22 •
15
9
9
1731
Tuesday, March 6; 2007
2
.6
0
0
3
10.
34
179
186
149
129
122
129
146
1161
147;
162
143
104
60
25
30
1'7
10
1948
Wednesday, March 7, 2007
3
2
4
3
1
11
42
171
166
145
139
137
157
160
A59
158
172
140
99
64
30
21
28
2
2014
Thursday, March 8, 2007
2
2
2
3
5
11
38
172
162
135'
131
143
117.
-136
' 201
180
177
137
132
56
31
•42
18
9
2042
Friday, March 2, 2007
2
2
2
1
6
12
30.
156
166
154
151
146.
141
139.
;167
190
167
151
112
74
54
37
40
16
2116
Saturday, March 3, 2007
13
6
2
0
4
2
20
38
79
141
140
161
171
173
:220
1988
228•
183
124 '
83
73
53
55
24
2191
Direction:
Southbound
sunaay, Marcn 4, ZUU7
20
1U
7
5
2
13
2B
45
64
118
141
155
187
212
1 199
171(
149
'97;4,108
HourBeglnning
50
50
37
26
13
1907
Monday, March 5, 2007
8
5
2
3
1
17
16
65
111.
98
107
109
105
115
1112.
144,
120
158.
143
87.
56
51
40
21
1694
Tuesday, March 6, 2007.
5
6
2
2
0
19
35
96
115
136
122'
116
137
130
126
137
145
164
137 -
109
71
49
33
18
1910
Wednesday, March 7, 2007
7
4
3
2
1
20
35
100
106
153
122
135
143
127
A 39
146
127
196.
140
92
67
60
36
13
1974
Thursday, March 8, 2007
4
5
2
2
2
18
31
131
144
139
115
110
131
149
! 131
144:
129•
163 •
138
101
72
58
49
27
1995
Friday, March 2, 2607
7
2
5
8
0
19
30
79
132
154
140
147
188
128
139
166
148
141.
164
88
57
72
.40
33
2088
Saturday, March 3,20V
13
7
5
5
1
20
31
80
86
124
159
176:
193
202
1195-
158,
153
150
91
.68
'56
58
40
44
2115
uIFUGUU :
i
aom vireeuons
i
HourBeglnning
10:0011.0012:001 3:00 4:0015:0016:0017:0018:001 8:00 10:00 11:001 1200 13:OQ j4:00
15:00 16:00r77.001 18:OQ 19:00120`00121:00122:00123:00
Sunday, March 4, 2007
34
21
10
8 4
17
39 73 115 201
255
285
368
394
1384
373
399
269-- `214.
110
102
76
40
28
3819
Monday, March 5, 2007
15
6
3
6 4
31
56 245 266 220
227
230
222
222
1238
363
282
275,'..;
5000
4500
4000
co
v
3500
a
N
d
t
3000.
w
2500
d
rn
R
a� 2000
>
Q
d
E • 1500
0
1000
500
0
gQ�
Speed Survey- Typical Weekday Average
Page Mill Road
Speed Ranee (mph)
1400
1200
Speed Survey - Typical Weekend Average
Page Mill Road
800
O
d.
a.
600
N
Q
N
400
0
200
Cf]
Speed Range (mph)
Stanford Trails, Page Mill Road
SJ06-843
Speed. Survey Results (3 -day totals)
<5
5-10
10-15
15-20.
20-25
25-30
.30-35
35-40
40-45
45-50
50-55
55-60
60-65
65-70
70-75
75+
Total
Southbound approach
1
6
175
207
539
3821
4607
1384
156
20
1
2
1
0
0
0
10920
Northbound approach
0
2
25
92
211
1208
2789
1448
207
17
5
0
0
0
0
0
6004
Total
1
8
200
299
750
5029
7396
2832
363
37
6
2
1
0
0
0
16924
Speed Survey Results (weekend totals)
<5
5-10
10-15
15-20
20-25
25-30
30-35
35-40
40-45
45-50
50-55
55-60
60-65
65-70
70-75
75+
Total
Southbound approach
15
7
278
308
327
1216
1172•
290
44
6
2
1
0
0
0
0
3664
Northbound approach
0
6
42
16
56
277
414
157
-31
4
2
0
0
0
0
0
1006
Total
15
13
320
324
383
1493
1586
447
75
10
74
1
0
0
0
0
4669
D.ne-L:
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for effective pedestrian detection
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t
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Ph.oto'b611a.rd ,Specif_cations:
Dimensions: 8" x 8" x 42".
Access: Top cap
:Construction: Aluminum, .25" thickness
Base anchor bolts: 1/2" x 12"
Base mount bolts: 1/4" x 20"
Mounting:. Plate inconcrete, break -away design
Axis: Adjustable rotation
.:Lens size:
Non=illuminated:
4",x 1.75"
Illuminated:.
8" x 6" wrap=around. .
Wiring requirements:
_
Non-illumnated:
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'LaneLight 18/6 auxiliary„cable
Illuminated:
...Lan auxiliary cable.&.16/2 grounded
System:
Use with LaneLight. controller, or stand-alone with logic relays _
Power consumption_: *;
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LaneLight system:
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add AC power value of 20 or 40 watt non -illuminated values
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Applicationidotes
Automatic activation bollard devices consist of "gateways" comprised of a pair
of. bollards. The bollards- are positioned to "invite" pedestrians to enter a
crosswalk at.a desired location.
The infrared sensing devices typically are preset by our factory. However, it is
possible to adjust the alignment of the sensor modules 'in the field:. The
infrared light: beams are projected to the respective receiver module. The
bollard "gate'..system is directionally sensitive and is activated only when
entering into te crosswalk,zone not when exiting...
At each end of the crosswalk entrances, a pair :of bollard devices are :placed
and normally there are 4 bollards per crosswalk. When pedestrians enter.into a
crosswalk zone they pass between :the bollards and the Smart .CrosswalkTm
system is automatically activated. Each" bollard contains 241.7 LED courtesy
lights making the bollardA isibl"e:at-night or.during.inclementW69ther.
Prior to installing bollards, the proposed site should be reviewed to observe
Spec Sheet#006.Rev C.
the- habits of local citizens using the crosswalk. The
bollards can .be:separated by as much:as 60 feet apart
to allow fora wide entry zone. Particular attention
should be paid as to how far:back pedestrians.. may_ "cut
the corner" when entering the -crosswalk.
General* P.erformance.Specifications
Parameter
Value ..
Maximum Separation
60 Feet
Power consumption
2.5 Watts .. ,
Operating Temp
.=200 to +80°C
Operating Voltage
9VDC to 15VDC
Color
White (Other Colors Avail -
Courtesy Light Color
Amber
Size
42" Tall, 8" Diameter
Mounting .Diagl-am
E•rs 112' J - 90.T (3)
la, 11UT (6) .
J� 112" LOCK WASHER (3)
112' FIaT W45hER (6) . .
'.Copyright 1998 — 2011 LightGuard Systems, Inc. All rights reserved. .
! 2292 Airport Blvd. Santa Rosa, CA 95403 Phone (707) 5424547; Fax (707) 525-6333
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LE►VE ^uaP DNL� FDR IEVEL:NG `t_
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'.Copyright 1998 — 2011 LightGuard Systems, Inc. All rights reserved. .
! 2292 Airport Blvd. Santa Rosa, CA 95403 Phone (707) 5424547; Fax (707) 525-6333
t y 1
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i
ATTACHMENT 3
FEHR)f PEERS..
From: Anjum Bawa and Nicole Hervol, Fehr & Peers
Subject: Sight Distance Analysis — intersection of Stirrup Way and Arastradero Road
SJ11-1261
This memorandum summarizes the•--results:bf�the sight=distance"'analysis conducted by Feh''r Peers to
evaluate the existing intersection of Stirrup=Way°.and„Arastradero Road located in' -the Town"bf Los Altos
Hills, Califomia. Below is a brief description of existing conditions observed during our field survey, a
>Aiscussion of.our analysis=approach; xmethodology=and: assumptions, concluding, with the results of the
analysis including a -list -of: recommended improvements: to, consider at the study intersection.
EXISTING CONDITIONS:
In the study area; Arastradero Road, classified as collector, is a two -166e roadway (one lane in each
direction plus bike lanes) and runs parallel to the Interstate' 280 Freeway. Stirrup Way is a two-way
undividedTneighborhood° road intersecting” Arastradero�Road frorn,the• `south'and: fo-rming "a T intersection
•with a; -stop sign- at Stirrup 'Way-, •the's minor? approach Arastradero ° Road is uncontrolled at the .study
intersection.:with:-a- westbound:. left-turn::pocket°:for motorists making a left—tum— onto southbound Stirrup
:Way The -T. -own is currd6gy-depeloping plans•to,install;Clei ll bicycle,lanes on Arastradero'Road. _ ,;-
An observation survey was conducted at the study intersection to develop an understanding of
obstructions .and driver,sight:aines from all:approaches The= survey 'involved. avisual assessment
conducted for both horizontal and vertical features- along both Stirrup Way and Arastradero Road 'to
identify any objects at heights above the elevation of the adjaceritzroac!Way 4haf., Wduld bbstructA e
driver's view. For the purpose of this survey, we, looked for objecWsucKzas`roadsidehardware;=hedges,
trees, bushes, walls, fences and the terrain itself. Figure 1 includes a collection of images showing view of
ar,typical=drives; stopped along :=Strrruo� Way at. -the. intersection of .Arastradero' Road=toolang'iri!'both the
westbound and eastbound directions. Also marked are the farthest. points visible to a driver stopped at
Stirrup Way when looking in both the east (305') and west (225) direction. The majority of the sight
'distance issues exist because the study intersection sits at the. crest of a grade "along: Arastradero -,Road.
The roadway dips in elevation both east and west of the intersection resulting in limited sight distance. for
traffic approach ing=the`intersection from
The Town° "of Los Altos Hills also provided collision data : om 2000 2010 at the Stirrup Way and
Arastiadero'"Road intersection During this -,time penod, two non iniury vehicular collisions :"occurred
(September 2001 and March 2004). The September 2001' incident`was a broadside`collision attnbuted'to
improper turning on Arastradero Road approximately 800 feet south of the intersection. The March 2004
incident was a sideswipe collision attributed to a vehicle'"traveling`on the wrong=side of the road -80 feet
west on Stirrup Way. No other recent collisions have been reported at this intersection. Neither of these
two collisions,was caused due to poor sight distance at the Stirrup Way/Arastradero Road intersection. ..
201 Santa Monica Blvd., #500, Santa Monica, CA 90401 (310) 458-9916 Fax (310) 394-7663
www.fehrandpeers.com-
Mr. Richard Chiu FEHR j9 PEERS
Town of Los Altos Hills 'J
June 9, 2011
Page 2
SIGHT DISTANCE ANALYSIS
Using the aforementioned survey information, a sight distance analysis was conducted for the study
intersection using guidelines provided by American Association of State Highway and Transportation
Officials (AASHTO) in °A Policy on Geometric Design of Highways and Street (2004)" Since the intersection
is stop -controlled along Stirrup Way, departure sight distances were calculated. A departure sight distance
is considered sufficient for a stopped driver on a minor -road approach to depart from the intersection and
enter or cross the major road. Ideally, provision departure sight distance wouldbe provided; however, in
many developed areas, departure sight distance is not able to be achieved due to the built environment or
terrain. In these cases, a minimum sight distance of stopping "sight distance is recommended. Both
departure and stopping sight distances are evaluated below.
Departure Sight Distance
For the purpose of this analysis the following two movements were analyzed since they were determined to
be most impacted by the potential obstructions observed at the study intersections:
• Left tum from Stirrup Way on to westbound Arastradero Road
• Right tum from Stirrup Way on to eastbound Arastradero Road
Departure . sight triangles were developed for traffic . approaching from eastbound and westbound
Arastradero Road. For the purpose.of this analysis, the decision point of the -departure sight.triangle along
Stirrup Way was located 14.5 feet from the edge of Arastradero Road. This represents the approximate
position of a typical drivers eye using the assumption a typical driver will stop approximately 6.5 feet from
the edge of Arastradero Road and the typical distance for a US passenger car from the front to the
drivers eye is approximately 8 feet -
According to AASHT°O, 'intersection, sight distance.- in, both directions should be. equal. to the distance
traveled at the.: design, speed of the major road during a period of time equal tothe time gap". where time
gap is the ;sufficient time for the minor -road vehicle to accelerate .from a stop and complete a left -tum
without:unduly -interfering with major -road traffic..operations. The following formula .was used to estimate
intersection sight distance for the aforementioned movements.
Intersection Sight Distance (ISD)=,4,47 x.Vmaa"°x
V111ej.r = Design speed of major road
t ,=.iime:gap for minor road vehicle to enter the major road
Following is a detailed sight distance analysis for the. aforementioned two movements using the above
formula.
Left -Tum from Stirrup Way
AASHTo recommends a time gap of 7.5 seconds for a stopped vehicle to tum left. onto a two-lane
highway with no median and grades 3 percent or less. Arastradero Road is currently posted with a speed
of 35. miles per hour. For_the purposed of this analysis, posted speed plus 5 miles per hour was used to
represent'design speed to determine sight distances. Using the formula provided above, the intersection
sight distance for stopped vehicle is.estimates as follows:
Intersection sight distance for passenger car (calculated). =1.47 x,40 mph 0.5 sec
441 feet
The calculated value of 441 feet was rounded to estimate the design sight distance of 445 feet. Using the
above estimated sight distance, departure sight triangles were drawn from stopped vehicles along
Mr. Richard Chiu
-Town of Cos Altos -Hills
June 9, 2011
Page 3 ' .
FEH R+ PEERS
eastbound -and westbound, travel lanes -of Arastradero Road. -Figure 2: shows the departure -sight distance
triangles. As shown in the figure, the westbound sight distance'triangle (right vieWof the driver's eye): has
potential obstruction from the. dip in elevation..of ,the roadway and also minor obstruction. from: trees/shrubs
located along the south side of Arastradero.Road. The eastbound sight -distance (left view of the driver's
eye) is: greatly obstructed by the .dip ;in elevation of Arastraderd Road and obstruction from ahe vertical
terrain and trees along the southM84_' 6f Arastradero `Road, west of Stirrup Vllay., Based ,. on the field
survey, available sight distance was measured at 225 feet. in the eastbounddirection ' d 306 feet in the
,westboundAirection:..:
.RiQht,Tum from fStirruo'Wav
A departure sight triangle for traffic approaching from the left was prepared ' for the stopped vehicle
A..
aright=tum from Stirrup Way'on to eastbound Arastradero Road. �The'intersection sight distance
was estimated -using the same formula -and assumptions'as 'used for the left=tums'ezcept"that for the
assumption regarding `time -gap AASHTO recommends reducing "'the t'me 'gap for` a standard US
`passenger bar'tom 7:5• seconds to 6-. 5 -seconds since drivers `making right -turns generally accept gaps
that. are slightly- shorter than those accepted in making left tums. Using the forriiuid, the intersection
sight-distance.is estimated as follows: r :
¢,
Intersection sight distanceforpassenger. car (calculated) =1.47 x 40 mph x6.5 sec
382.2 feet:.
The calculated value of 382.2 feet was rounded to the estimate design sight distance of 385 feet. Figure 2
shows`the departure sight distancealong the` eastbound -travel, lane (left view '.of driver's eye) from the
stopped -vehicle- As can'be seen in the* figure;:the,eastbound sight4stance (left view of"the driver's eye)
is"obstructed by the dip- in'- elevation of ArastrWero Road liBased on the field surrey, the' available sight
distance was:measured at225feet in the eastbound direction:'
Stopping Sight Distance
In addition _to the- departure -sighti�distance, -sfopping ; sight distance, is -alsopresented for"'Arastradero
Road. As described! by AASHTO `"Stopping -sight, -distance &—the length of the'ibadway ahead that is
visible to the driver The available sightdistance on a roadway should. -be suiiraentty long to;enable a
M vehicle. travelling at, or near the design speed, to,stop before reaching a stationary�obje# in. ifs -path. If "is.
... .. i sti.:......�
also desixibed as the sum of two distances:.(1) the:rlistance traversed by_the vehicle --from ythe,;instant the
driver sights an object necessitating a stop to the instant the brakes are applied, and (2) the distance
needed :to'stop-the vehicle fronrithe instance brake applisafion begins". Arastradeb Rd -16 cuiiently
postedwith_ a- speed of 35• miles aper hour (mph) For --the purposed' ofi this analysis, the° design speed was
assumd&W. bw-5 inph , more than . the -posted speed' and used toy determine v sight distances. ,AASHTO
recommen&s!a stopping'^sight.distance of: -305 feet'f6r'a40 mph'design`speed: Ttie regwred stopping
sight distance is also.. indicatedbn�Figure 2.
Based on the field survey, the available sight distance was measuredat:225.feet in: -..the eastbound
direction, and 305 feet in the westbound direction.
RECOMMENDATIONS
Based on our observations during the survey and the sight -distance analysis presented above, we
determined the main reason for limited sight -distance along Arastradero Road is due to the dip in
elevation of Arastradero Road east and west of Stirrup Way. The adjacent hillside looking eastbound also
partially obstructs a driver's sight lines.
Several potential solutions may be considered to improve the sight distance at the Stirrup,
Way/Arastradero Road intersection. We have listed these in decreasing order of most improvement to
Mr..Mchard Chiu
Town of Los Altos Hills
June 9, 2011
Page 4
FEHRtPEERS
sight distance-(i.e., the improvement that most improves sight distance is listed first)..A brief discussion of
major constraints is listed for each potential solution.
1. To 'provide -full visibility within the recommended departure sight=distance triangles, regrade
Arastradero Road approximately 400 feet from Stirrup Way in both directions. We consider this
solution to be cost prohibitive. Additionally, it would require removal. of several large trees in the
vicinity of the intersection.
2. Trim and/or remove the partial vertical obstructions caused by the hillside and trees along the
south -side of the Arastradero Road, west of .Stirrup Way. This improvement will allow for better
sight distance for driver along west from Stirrup Way, but the grade of the .roadway still limits the
sight distance from intersection in both directions.
3. Install a traffic signal.: Although this -option could manage movement of traffic through the
intersection, it does not improve the sight, distance for a vehicle making a right -tum -on -red from
Stirrup Way on :to eastbound Arastradero Road. The traffic volume may not support the
installation of a.full signal. A traffic signal is not supported by the Town's rural character and is not
recommended. _ .
4. Install radar speed feedback sign along the eastbound approach of Arastradero Road (west of the
intersection with Stirrup Way). This will help maintain vehicular speeds closer to the posted 35
mph speed. limit as a driver approaches the intersection. If -drivers were to travel 35 mph, the
required stopping sight distance is 255 feet. This reduction in travel speed. would improve the
stopping sight distance in the eastbound direction.
5. Install flashing beacons on Arastradero Road,: which. will warn motorists who.are approaching the
intersection of Stirrup Way, toslow down. -and watch for vehicles present in the intersection.
Placement of the beacons in the westbound direction would require addition of "limited sight
distance" signs'. in the eastbound direction; the beacon may be placed with the. existing warning
sign. The beacons may be activated by a vehicle stopped on Stirrup Way and waiting to make a
left- or right -tum on to Arastradero Road. This improvement will. not improve sight distance but it
will enhance drivers' awareness of the limited sight distance at the intersection. Additionally, if a
vehicle on westbound Arastradero Road is tuming.left onto Stirrup Way, the beacon would not be
activated. For this reason, this improvement is not recommended at this time.
6. Install rumble strips approximately 100-150' east and west of the intersection to warn motorist of
a possible. vehicle present in theintersection. This improvement -may -,confuse motorists.asYtheyy�-li��.__...,
approach the intersection, and is=not recommended.-.
Based on discussion of the potential options and conversations with the Town staff, we recommend that
the Town of Los,Altos Hills install a radar speed feedback sign on the eastbound approach of Arastradero
Road. We recommend the radar .feedback sign: replace the existing posted speed limit sign halfway
between the Arastradero Road/Page Mill Road and Arastradero. Road/Stirrup Way intersections. We also
recommend that the vegetation' be regularly trimmed on both sides of the intersection to reduce any
potential obstructions to sight lines.
Please feel free to contact us with any questions. Thank you.
F.EHRSSt'PE,ERS.
TRANSPORTATION CONSULTANTS
Jun 00,:2011.FPA
'Anyalm N Ori-\Juba\A.0-W Jah\ffight Oistann Matyaia — Loa Attoa Ffi➢a\SghU7tataneNnalyva10110sm.d.g
EXISTING CONDITIONS VISUAL'SURVEY
-SIGHT DISTANCE ANALYSIS
STIRRUP WAY & ARASTRADERO ROAD
FIGURE 1
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k
1' RIGHT-TURN FROM STIRRUP WAY
F E H R & PEERS SIGHT DISTANCE ANALYSIS
TRANSPORTATION CONSULTANTS STIRRUP WAY & ARASTRADERO ROAD
Jun 08, 2011 FPA
*.\Lft Angaie9 N Drfn\Job.\AeUve\SI Jab.\sghe Did— Analyst. - Lm ams FMIS\SightOlsmnaeAn*WslDI JOSDe..sg FIGURE 3
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ATTACHMENT 5
Traffic Safety Committee Meeting Notes
By Steve Bristow, 3/3/2012
These are my notes from. the meeting held on Tuesday 28,2012 at -the Los Altos Hills Town Hall.
Ginger Summit: was. taking notes; also and;.opened the -meeting as: interim chair.-Thesenotes
reflect the notes -that I have taken and input from other members of -the committee. Ginger
may have abetter version .available.,
The meeting was convened b� Ginger Summit -7 7pm,at the town hall of Los Altos Hills
Present were: r
Ginger Summit, 8summit@eathlink net
2- Steve Bristow, mrbristow@aoCcom: 650=948-8925 '
3 Steve Schmidt, steve@hiehenerevaudits com , stev6@schm'idt.net
Anderson,'druandersn@aol:com `650-208-6550 57 ---Martha Bowden, 650=948-2302, marEfiabocJen@sbcelobal.ne't
. ,:
6- Kjelf Karlsson , �ellhkarisson@emeail coin.
7 Breene'Kerr, Breene@visuahzesoi'ar.corri..
8 Les Earnest, les@cs.stanfo'rd.edu , 650-941 3.984. '. t„-
9- Don Morrissey, sheriff of Santa.Clara County -
10-: Mike Wagner, mike@ideatravel.com , mwaener@litonics.com
11 RichardChiu, engineer for the Town of Los Altos Hills rchiu@losaltoshills.ca.eov
Othersnn'the mailing list:: - '` ` .
michelle@voi'cent.com
Deb6iaA=Padovan, City Clerk, 650-947-2513','d' adovan@losaltoshills.ca:eov
Meeting notes:
a-= %Xylewvas selected as chairman'of-the groups Martha was `elected as:Vice Chair; and
Steve Bristowlwas-selected-assecretary:=z�:_:_A-'—
b- Sherriff Morriss'ey:has experience:in working with committees' like ours: -He Sivas filling in
for his,captain He -,may be at.future meetings: Hisattendance was�aopreciated. He took
on the; researching any h- -spot 31n traffc:problems in`LAH -He said he Would
provide this. information'possibly:os sooh' as'our next meeting. -
c- The published agenda was gone through and will: not-be>duplicated in these'notes .
d- ..A.subcommittee.was agreed: upon to review the traffic calming draft from Richard that
is composed of Steve Bristow as Chair. and Martha Bowden, Steye_Schmidt, and•Dru
-- -• ,;:., r ,_.:..
Anderson. Ginger.: Summit volunteered to. not be a member officially as she,is committed
out'as to her ability to handle a full`time committee rmembership, but would like to be
able to add input to the subcommittee when she can. Given the number of her other
obligations Steve Bristow told her after the meeting than any input that she would be
able to add would be welcome.
e- Steve Bristow will gather as a next step comments from all that may have them of
comments on the traffic calming draft. He will then publish them in a collected draft
where all the comments can be viewed at the same time. It was recognized during
discussions at the meeting,that any traffic calming plan needs to work in conjunction
with other town work regarding the circulation plan or circulation element. It was left
open.at the conclusion as to how to best co-ordinate between the groups working .on
traffic calming -and traffic circulation. This question Was not resolved at the meeting,
but was left assomething that needs to:be worked out.
f- During the discussion of the. page mill/280 intersection Les Earnest offered to post to
the committee a_previous proposal that he had authored. He has provided this to all the
committee members. This was part of an ongoing discussion about this intersection in
which Richard, delivered to the committee a number of alternative proposals,that have .
been prepared regarding this intersection. So that the committee can do a better job,
Richard will tryand arrange a presentation by the consultants who prepared draft
proposals for flow and traffic readjustment to the committee before we make
recommendations,to the town council
g- As part of the agenda there was discussion. about the item 5A =- "arrastadero retaining
wall". The committee had a consensus that the work to lower the height of the retaining
wall was a good thing: There was a general consensus that a goal would be to make.
both the north and south bound bike lanes the same T width. There'was also
agreement that the town should make maximum use of the area up to the Caltrans
fence to provide extra space for runners and room for cars -in distress`to pull out of the
traffic lane. Richard received all this input and will process it.
h- As part of the agenda there was discussion about item 5B –" Oversized vehicles".
Richard passed out a draft document and it was.discussed. Comments were received
from most committee members. Steve Bristow suggested that parking of oversized
vehicles or vehicles that impeded traffic might be part of the document. There was
general committee agreement that the definition of what is a Town Holiday needs to be
better defined in the draft document.
I- The traffic safety Improvements at Page Road Mill and Buena Vista were discussed. The
committee agreed tosupport,.Phase.l_of the proposed work:;-Ricbard and the town were"
recognized for -being able to work with all the_civil jurisdictions involved.
—�1 j Traffic.Safety improvements between Page Mill Road and Stirrup Way were discussed.
The committee was in agreement to upgrade the stop sign to one with a solar powered
speed indication similar to one installed:near Bullis School. While location of the
replacement sign was discussed, there was no agreement that -the sign location would
be changed..
Next steps– next meeting will be at the 4t' Tuesday of each month in the council chambers at
7pm. Based upon this plan the next meeting will be 3/27@7pm