TC - Item 4A - Request to Review Traffic Conditions at Hellman Avenue and Del Mar AvenueROSEMEAD TRAFFIC COMMISSION
STAFF REPORT
TO: TRAFFIC COMMISSION
FROM: CHRIS MARCARELLO, PUBLIC WORKS DIRECTOR
DATE: MAY 17, 2012
SUBJECT: REQUEST TO REVIEW TRAFFIC CONDITIONS AT HELLMAN AVENUE
AND DEL MAR AVENUE
SUMMARY
Staff received a request that the Traffic Commission review traffic conditions at Del Mar
Avenue and Hellman Avenue. Field observations were conducted at the location, including
traffic counts and tracking vehicle movements in adjacent areas (including nearby
businesses). A summary of these findings is included as an attachment to this report. To
summarize, the report reviews the following concerns:
• Consideration of traffic signal modifications, including the addition of protected left
turn modifications or protected /permissive left turn modifications; and
• Consideration of adding a designated right -hand turn only lane from eastbound
Hellman Avenue to southbound Del Mar Avenue.
The traffic study conducted at this location concludes the following:
Left -Turn Traffic Signal Modifications
• There are not sufficient delays to justify modifications to a protected or
protected /permissive left turn. Approximately 19.4% of eastbound traffic is delayed
(forced to wait an additional signal cycle) in the afternoon and approximately 1.9% is
delayed in the morning. Neither meets the requirement of an 80% delay to justify a
protected left turn.
• Traffic accident history data was not available at the time this study was completed,
but will be provided to the Commission prior to its consideration of this item.
• There is sufficient volume to justify the addition of protected /permissive turn
modifications, although this change is not recommended at this time due to the
observation that there is little delay at this location.
Right -Turn Lane Addition
• Approximately 68 vehicles were observed turning right from eastbound Hellman to
southbound Del Mar in the afternoon, while 60 vehicles were observed in the
morning hours. Neither meets the requirement of 100 vehicles during a peak hour to
justify the addition of a right turn.
Traffic Commission Meeting
May 17, 2012
Page 2 of 2
• There is adequate spacing to accommodate a dedicated right -turn lane; however,
this modification will require changes to existing street striping, signage, and traffic
signal detection equipment. A dedicated right -turn lane is not recommended at this
time due to the low traffic volume observed at this location.
RECOMMENDATION
It is recommended that the Traffic Commission:
1. Review and comment on the traffic study; and
2. Direct staff to re- evaluate the traffic conditions at this location in approximately 6
months to determine if traffic volumes have changed.
ANALYSIS
A detailed analysis is included as an attachment to this staff report. Additionally, a review
of traffic accidents will be forwarded to the Commission prior to its consideration of this
item.
Submitted by:
Chris Marcarello
Public Works Director
Attachment 1: Neighborhood Overview
Attachment 2: Field Observations /Analysis Memorandum
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CITY OF ROSEMEAD
Fully Protected Left Turn Warrant Criteria
(from CA MUTCD 2010 Edition)
When other means of eliminating left turn conflicts are not practical, the use of fully
protected left turn phasing operation should be considered when one or more of the
following conditions exist:
1. Collisions - Five or more left turn collisions for a particular left turn movement
during a recent 12 -month period.
2. Delay - Left -turn delay of one or more vehicles, which were waiting at the
beginning of the green interval and are still remaining in the left turn lane after
at least 80% of the total number of cycles for one hour.
3. Volume - At new intersections where only estimated volumes are available, the
following criteria may be used. For pretimed signal or a background-cycle -
controlled actuated signal, a left turn volume of more than two vehicles per
approach per cycle for a peak hour; or for a traffic - actuated signal, 50 or more
left turning vehicles per hour in one direction with the product of the turning
and conflicting through traffic during the peak hour of 100,000 or more.
4. Miscellaneous. Other factors that might be considered include but are not
limited to: impaired sight distance due to horizontal or vertical curvature, or
where there are a large percentage of buses and trucks.
NOTE: The most recent edition of the CA MUTCO should be referred to when analysis of fully
protected left turn warrant criteria is conducted.
CITY OF ROSEMEAD
Protected/Permissive and Permissive/Protected
Left Turn Warrant Criteria
REVISED
When other means, not including left turn phasing, for eliminating left turn conflicts are
not practical, the use of protected/ /permissive or permissive /protected phasing
operation should be considered when one or more of the following conditions exist:
Delay - Based on an engineering field study, one or more vehicles are
consistently delayed more than one cycle when making a left hand turn.
2. Volume — Daily volume of 80 or more vehicles per hour completing the left
turn movement.
3. Miscellaneous — Other factors that might be considered include but are not
limited to: intermittent, but anticipated heightened left turn demands, such as
from special events, limited left turn storage capacity, or special conditions
identified in an engineering study.
Transportation Stadia, Inc.
2640 Walnut Avenue, Suite H
Tustin, CA. 92780
City: ROSEMEAD
NS Dlrectlon: DEL MAR AVENUE
E -W Direction: HELLMAN AVENUE
File Name : H1205026
Site Code : 00005057
Start Date : 5/6/2012
Page No :1
_ Groups PrlM Tu Movements
-' -- DELMARAVENUE ' HELLMANAVENUE DELMARAVENUE HELLMANAVENUE
T_ Southbound +_ _. � ��
Westbound Northbound Eastbound
r—� . _._ ers - T - _ r__ _ - _ — � - _ —i -1
07:00 AM i
19
110
9
2 ''.
20
35
6
2
!
1
147
10
15 I
4
13
20
0
19
394
413
07:15 AM ''.
10
114
8
4
18
51
B
10
1
168
22
9 1
7
16
34
4
27
449
478
07:30 AM
26
126
15
1
21
61
16
3
5
256
25
3 '
13
37
41
1
8
642
650
_ 07:45 AM,
27
199_
.122
22
58
_12
121
7298
22
141
10
4
753
Total,
82
549
44
B f
B1
205
42
27
14
859
79
41
34
102
147
9
_32
86
2238 -
- 2324 -
08:00 AM
39
261
13
0
16
48
18
0
11
194
14
12
19
40
37
3
15
710
725
08:15 AM
27
162
14
2
17
65
7
2
8
209
13
3
18
40
41
7
14
621
635
08:30 AM
19
164
10
2
25
52
14
5
3
178
7
4 1
10
28
37
1
12
647
559
08:45 AM
14
157
14
2 {
22
61
7_
6 �
2
202
12
1_
10
27
46
0
9
S74
Total
99
744
51
6
80
226
46
13
24
783
48
20 _
57
135
161
11
50
2452
2502
BREAK "
04:00 PM
25
196
17
0
17
30
9
5
7
159
9
13 1
10
47
39
5
23
565
588
04:15 PM
27
160
19
3
6
25
7
2
8
154
9
3
8
55
25
0
8
523
531
04:30 PM
31
174
23
2
11
32
5
13
2
158
7
8
14
30
25
1
22
512
534
04:45 PM -8
_
15
26
11
0
3
175
_ 1_
0_
0
17_
43
33
5
585
590
Total i
12
1 9_.
78_ 2 �
49
113
32
20
20
646
35
22 1
49
175
122
- 9
58
2185
2243
05:00 PM
37
204
23
0
7
25
4
6
7
158
6
3
9
44
38
0 1
9
562
571
05:15 PM
33
215
23
0
15
35
8
6
10
207
16
4
22
67
40
1
11
690
701
05:30 PM
42
218
34
3
25
35
10
6
6
213
19
4
14
56
30
3
16
702
718
0.5:45 IM
215
18
8_
8
37
7
7
8
188
13
1
23
76
47_
0
14__
670
684
Total
142
_ _
852
98
9
55
132
29
31
766
53
. _
12 7
88
___
243
155
_
4
_
50
2624
2674
Gtand Total
444
2889
272
31
265
676
149
85
89
3064
213
95
206
655
585
33 1
244
9498
9743
Apprch %
12.3
80.1
7.5
24.3
62
13.7,
2.7
91
6.3
14.4
45.2
40.4
Total %
4.7
30.4
2.9
2.8
71
1.6
0.9
32.2
2.2
2.2
6.9
62
2.5
97.5
Tra Studies, Inc
2640 Walnut Avenue, Suite H
Tunin, CA. 92780
City: ROSEMEAD
N -S Direction: DEL MAR AVENUE
E -W Direction: HELLMAN AVENUE
File Name : H1205026
Site Code :00005057
Start Date : 5/812012
Page No : 2
L __
DEL MAR AVENUE
Southbound
r HELLMAN AVENUE
Westbo
DEL MAR AVENUE
Northbound
HELLNI AVENUE
Eastbound
Btalt T lme 1
Rluht _Thru _ LeR asl, Tom _
_Right I Thru. _ Left I Avv, Tow
Right 1 Th7, Left I App. Tow
I Right I Thru I Left I APr, TOW
read Flour Analysis From 07:00 AM to 08:45 AM - Fast: 1 of 7
DEL MAR AVENUE
ou t In Total
L7opid , pi F zt_2s 1
Peek Hour for Entire Intersection Begins at 07:30 AM
1 191716
341
reels Taw Left
07:30 AM
26 126 15 1671
21
61
16
98
5
256
25
286
13
37
41
91
07:45 AM
27 199 12 236
22
56
12
92
7
299
22
327
10
34
52
98
08:00 AM
99 267 13 979
16
48
78
82
17
184
14
219
19
48
37
98
_08:15AM_;_
27 162 — 14 203
17_
65
891
8
209
13
230
18....___40_
41
99
Total Volume
119 748 54 921
76
232
_
53
361
91
957
74
1082
60
157
171
382
% App. _Total
l 12.9 81.2 5.9
21.1
64.3
14.7
1
2.9
90.1
7
15.7
39.5
44.8
4 -a
Lea _T6N Filed
- fill _ 967r_ 31'
I
O In n In T
r1Fl MAR AVFNII
Int. Tabi 1
642
759
710
DEL MAR AVENUE
ou t In Total
L7opid , pi F zt_2s 1
1 191716
341
reels Taw Left
4 1 F
Peak Hour Data
A,
_
�so
71
North
I Peek Hourilegmat07:30�
i 3
MovememA
Turning
se
4 -a
Lea _T6N Filed
- fill _ 967r_ 31'
I
O In n In T
r1Fl MAR AVFNII
Int. Tabi 1
642
759
710
Transportation Studies, Inc.
2640 Walnut Avenue, Suite H
Tustin, CA. 92780
City: ROSEMEAD
NS Directon: DEL MAR AVENUE
E -W Direction: HELLMAN AVENUE
File Name : H1205026
Site Code :00005057
Start Date :518/2012
Page No :3
DEL MAR AVENUE HELLMAN AVENUE DEL MAR AVENUE HELLMAN AVENUE
__ Southbound _ _ Westbound Northbound_ _Eastbound__
Start Time Right Thru Leib MP rets Right Thru L_Left - App_Teq. Right Thru Left) nPV -� Rly Thnr I Left A ry Tmel_.
IM.741911
FWK Flour Analysis broth u4:uu PM to 5:45 PM
- PeaK I or 1
North
�IQ
I
J € �
Peak Hour Begins at O5:o0 PM 1 -1(�
liumlo0.nq
L�g
55 ���
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If
Peak Hour for EnB
he Intersection Begins at 05:00
PM
05:00 PM
37 23
11 1...._
05:15 PM
33 215 23 271
15
35
B
5
10
207
15
232
22
67
40
129
05:30 PM
42
25
3S
30
100 i
702
5 PM
a
37
7
62
a
188
13
20 9
23
870
Total Volume
7 2 852 - � — 98 1092
5
132 -
29
216
31
75
53
850
8
249
155
488 I
2824
out_ In T ate_
C._Pie7 � Sp2? z4ee
I 5 on
- Rleht Thtu Lea
4 -I t
Peak Hour Data
_
North
�IQ
I
J € �
Peak Hour Begins at O5:o0 PM 1 -1(�
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W I LLDAN
Engineering
Memorandum
TO: Chris Marcarello
Director of Public Works
FROM: Joanne Itagaki
Traffic Consultant
DATE: May 9, 2012
SUBJECT: HELLMAN AVENUE AND DEL MAR AVENUE — REQUEST FOR
EAST/WEST LEFT TURN PHASING AND EASTBOUND TO
SOUTHBOUND RIGHT TURN LANE
As requested, I have reviewed the concerns related to traffic on Hellman Avenue and
Del Mar Avenue. You indicated the concerns include:
1. the delay experienced by east and west left turn movements. Consider possible
installation of east/west left turn phasing on Hellman Avenue at Del Mar Avenue.
The left turn phasing could be protected /permissive left turn (PPLT) phasing or
protected left turn (PLT) phasing.
2. the delay experienced by eastbound to southbound right turn movements.
Consider possible installation of an eastbound right turn only lane.
Existing Conditions
Hellman Avenue is an east/west roadway approximately 44 feet wide with one lane of
traffic in each direction. Opposing lanes of traffic in the vicinity of Del Mar Avenue are
generally separated by a double yellow centerline. Separate eastbound and westbound
left turn lanes are provided at Del Mar Avenue. Parking is generally prohibited in this
area of Hellman Avenue with red curb. The posted speed limit is 30 mph on Hellman
Avenue.
Del Mar Avenue is a north /south roadway approximately 64 feet wide with two lanes of
traffic in each direction. A double yellow centerline separates opposing lanes of traffic.
Separate northbound and southbound left turn lanes are provided on Del Mar Avenue at
Hellman Avenue. Parking is generally prohibited except on the east side of Del Mar
Avenue south of Hellman Avenue where parking is allowed. The posted speed limit on
Del Mar Avenue is 40 mph.
The intersection of Hellman Avenue and Del Mar Avenue is signalized. There are
marked crosswalks on all legs of the intersection. The traffic signal is a 2 phase signal
operation (north/south and east/west) with no left turn phasing provided at the
intersection.
Page t of 4
May 9, 2012
HELLMAN AVENUE AND DEL MAR AVENUE —
REOUEST FOR EASTMEST LEFT TURN PHASING AND
EASTBOUND TO SOUTHBOUND RIGHT TURN LANE
Page 2 of 4
Data Collection
Peak period turning movement counts were taken at the intersection of Hellman Avenue
and Del Mar Avenue. The counts were taken on Tuesday, May 8, 2012 from 7:00 to
9:00 AM and 4:00 to 6:00 PM. These turning movement counts revealed the following:
Table 1
Peak Hour Turning Movement Counts
Hellman Avenue and Del Mar Avenue
Left turn delay studies were also conducted for eastbound and westbound left turn
movements on Hellman Avenue at Del Mar Avenue. The delay.studies were conducted
on Tuesday, May 8, 2012 from 7:00 to 9:00 AM and 4:00 to 6:00 PM. The delay study
counts the number of vehicles waiting to turn left at the end of the red signal phase and
then counts how many vehicles turn during the green signal phase and the yellow signal
phase. This helps to determine how many left turning vehicles are delayed from making
this movement and have to wait through another signal cycle. The left turn delay
studies reveal the following:
• 103 signal cycles occurred between 7:00 -9:00 AM and 4:00 -6:00 PM.
• 7:00 -9:00 AM
o No left turn movements were delayed in either the eastbound or
westbound direction.
4:00 -6:00 PM
0 20 of 103 cycles (19.4 %) were delayed for the eastbound direction.
0 2 of 103 cycles (1.9 %) were delayed for the westbound direction.
7:30 -8:30 AM
5:00 -6:00 PM
NB Left Turn
74
53
NB Thru
957
766
NB Right Turn
31
31
SB Left Turn
54
98
SB Thru
748
852
SB Right Tumil
119
142
EB Left Turn
171
155
EB Thru
151
243
EB Right Turn
60
68
WB Left Turn
53
29
WB Thru
232
132
WB Right Tum
76
55
Left turn delay studies were also conducted for eastbound and westbound left turn
movements on Hellman Avenue at Del Mar Avenue. The delay.studies were conducted
on Tuesday, May 8, 2012 from 7:00 to 9:00 AM and 4:00 to 6:00 PM. The delay study
counts the number of vehicles waiting to turn left at the end of the red signal phase and
then counts how many vehicles turn during the green signal phase and the yellow signal
phase. This helps to determine how many left turning vehicles are delayed from making
this movement and have to wait through another signal cycle. The left turn delay
studies reveal the following:
• 103 signal cycles occurred between 7:00 -9:00 AM and 4:00 -6:00 PM.
• 7:00 -9:00 AM
o No left turn movements were delayed in either the eastbound or
westbound direction.
4:00 -6:00 PM
0 20 of 103 cycles (19.4 %) were delayed for the eastbound direction.
0 2 of 103 cycles (1.9 %) were delayed for the westbound direction.
May 9, 2012
HELLMAN AVENUE AND DEL MAR AVENUE —
REQUEST FOR EASTANEST LEFT TURN PHASING AND
EASTBOUND TO SOUTHBOUND RIGHT TURN LANE
Page 3 of 4
The reported accident history was requested for the intersection of Hellman Avenue and
Del Mar Avenue. However, as of this writing, this data has not been supplied by the LA
County Sheriff's Department.
Discussion
The City has left turn warrant criteria (attached) for both protected left turn (PLT) and
protected - permissive (PPLT) phasing. The fully PLT phasing criteria has not changed
with the adoption of the new 2012 California Manual on Uniform Traffic Control Devices
(CA MUTCD).
Protected Left Turn Phasing Analysis
1. Collisions — Reported accident data was not available at time of writing.
2. Delay — The delay study did not identify any left turn delay in the morning peak
period. During the afternoon peak period, 19.4% was delayed in the eastbound
direction and 1.9% in the westbound direction. This does not satisfy the 80%
required of the warrant criteria.
3. Volume — This intersection is not "new ". However, we reviewed how the traffic
volumes would relate to this warrant. The traffic volume counts identified:
• AM Peak Hour: 171 eastbound left turns v. 232 westbound through = 39,672;
53 westbound left turns v. 151 eastbound through = 8,003.
• PM Peak Hour: 155 eastbound left turns v. 132 westbound through = 20,460;
29 westbound left turns v. 243 eastbound through = 7,047.
• The existing traffic volumes would not satisfy the 100,000 warrant criteria.
4. Miscellaneous — There are no other factors that were considered regarding the
requested left turn phasing analysis.
Recommendation: Based on the analysis of the Fully Protected Left Turn Warrant
Criteria of the City of Rosemead, the installation of east or west protected left turn
phasing is not recommended at this time.
Protected - Permissive Left Turn Phasing Analysis
1. Delay — The delay study did not identify any left turn delay in the morning peak
period. During the afternoon peak period, 19.4% was delayed in the eastbound
direction and 1.9% in the westbound direction. This does not satisfy the warrant
criteria.
2. Volume — The traffic volume counts identified peak hour volumes of 171 and 155 in
the eastbound AM and PM peak hours respectively. The westbound peak hour
volumes were less than 80. Though not specifically counted, based on the peak
hour volumes, the eastbound left turn volumes may satisfy the daily volume of 80 or
more. The eastbound left turn direction is likely to satisfy this warrant criterion.
3. Miscellaneous - There are no other factors that were considered regarding the
requested left turn phasing analysis.
May g, 2012
HELLMAN AVENUE AND DEL MAR AVENUE -
REOUEST FOR EASTANEST LEFT TURN PHASING AND
EASTBOUND TO SOUTHBOUND RIGHT TURN LANE
Page 4 of 4
Recommendation: The eastbound left turn volumes do satisfy the "Volume" criteria.
The City may consider the installation of protected/permissive or
permissive /protected left turn phasing in the eastbound direction of Hellman Avenue
at Del Mar Avenue. Based on the minimal delays, however, 1 would not recommend
the installation of protected/permissive or permissive protected eastbound left turn
phasing at this time.
Eastbound Right Turn Only Lane Analysis
In general, separate turning lanes (left or right turns) are considered when the volume of
turning traffic exceeds 100 vehicles during a peak hour. The turning movement counts
taken at the intersection of Hellman Avenue and Del Mar Avenue indicate the
eastbound right turning volume was 60 during the AM peak hour and 68 during the PM
peak hour. These eastbound right turning volumes do not exceed 100 vehicles per
hour.
In addition, the width of Hellman Avenue is 44 feet. Currently, the lane configuration on
Hellman Avenue provides a 15 foot westbound lane, 10 foot left turn lane and 19 foot
eastbound lane. Due to the curb and gutter on the side of the roadway, a 12 foot right
turn lane should be provided to allow for the appropriate width to execute the turn. This
would require "shifting" the travel lanes on Hellman Avenue 2 feet to the north and
reducing the westbound travel lane to 13 feet.
The width of Hellman Avenue could accommodate the eastbound right turn lane.
However, major striping changes would be necessary along with the installation of loop
detectors. If such a move is approved, a complete signal modification plan is suggested
to clearly define the necessary changes.
Recommendation: Based on the eastbound right turning volumes, the
installation of a right turn only lane is not recommended at this time.
Attachments
Neighborhood Overview - Photos
Fully Protected Left Turn Warrant Criteria
Protected/Permissive and Permissive /Protected Left Turn Warrant Criteria
Peak Period Turning Movement Counts
Left Turn Delay Study
0*17470•Red 2008 TE oncalAEnglneedng WodA2a12Qel Mara Hokanla -9.12 TC Memo RE Hellman & Del Mar.doc