TC - Item 3A - Traffic Review at the Intersection of Mission Drive and Pistache LaneROSEMEAD TRAFFIC COMMISSION
TO: TRAFFIC COMMISSION
FROM: CHRIS DASA, IO OF PUBLIC WORKS
DATE: FEBRUARY 4, 2021
STAFF REPORT
SUBJECT: TRAFFIC REVIEW AT THE INTERSECTION OF MISSION DRIVE AND
PISTACHE LANE
SUMMARY
The City of Rosemead received a request to review measures that would improve the line of sight
for vehicles turning left from Pistache Lane onto Mission Drive due to the view being obstructed
by parked vehicles on Mission Drive. On behalf of the City of Rosemead, engineering staff has
completed a traffic review to evaluate the intersection and recommend appropriate measures that
would improve the line of sight for vehicles turning from Pistache Lane entering traffic onto
Mission Road.
ANAT.VSiS
The traffic review included an analysis of the existing roadway conditions, review of
approximately 6 years of available collision data, review of available average daily traffic counts,
review of the documented 85th% of speed on Mission Drive, as well as a line -of -sight analysis.
The placement of all traffic control devices is dictated by engineering judgment and based on
guidelines found in the CAMUTCD (California Manual on Uniform Traffic Control Devices) and
the CVC (California Vehicle Code).
Mission Drive is an east/west arterial roadway per the City's Master Plan of Streets with a posted
speed limit of 35 MPH just east of Walnut Grove Avenue. This segment of Mission Street also has
posted school speed limit signage of "School 25 MPH When Children are Present" sign for
eastbound travel located approximately 105 -feet west of Muscatel Avenue. Mission Drive is
approximately 63 -feet wide, with two lanes in each direction and a solid double yellow centerline.
Parking is allowed on both sides of Mission Drive except along segments with "No Stopping
Anytime" signs. There is no existing red curb on either side of Pistache Lane as it intersects with
Mission Drive, however there are existing red curbs located east and west of Dubonnet Avenue as
it intersects with Mission Drive. The Citywide speed survey conducted for the City shows that the
85th% of speed is at 36 MPH. Mission Drive carries about 19,000 vehicles per day. Land use is
mainly a mix of Single Family Residential, church with some office. The minor streets of Pistache
Lane and Dubonnet Avenue are both cul-de-sac's and are stop controlled at Mission Drive.
City Traffic Commission Meeting
February 4, 2021
Page 2 of 4
Pistache Lane runs north/south and is considered a residential local roadway per the City's Master
Plan of Streets with a prima facie speed limit of 25 MPH. Pistache Lane where it intersects with
Mission Drive is approximately 56 -feet wide and narrows down to 35 -feet with one lane in each
direction and no marked center line. Pistache Lane is a cul-de-sac. Pistache Lane is stop controlled
at the intersection with Mission Drive for vehicles heading southbound along Pistache Lane and
is uncontrolled in the east/west directions along Mission Avenue. In this area, Pistache Lane runs
through a Planned Development Residential zone with 12 houses with direct access.
Dubonnet Avenue runs north/south and is considered a residential local roadway per the City's
Master Plan of Streets with a prima facie speed limit of 25 MPH. Dubonnet Avenue where it
intersects with Mission Drive is approximately 30 -feet wide and narrows down to 28 -feet with one
lane in each direction and no marked center line. Dubonnet Avenue is a cul-de-sac. Dubonnet
Avenue is stop controlled at the intersection with Mission Drive for vehicles heading northbound
along Dubonnet Avenue and is uncontrolled in the east/west directions along Mission Avenue. In
this area, Dubonnet Avenue runs through a single-family residential zone.
Collision data was obtained from the computerized collision records system maintained by the
State of California called the Statewide Integrated Traffic Records Systems (S WITRS). A review
of all collisions that occurred within 100 -feet of the intersection of Mission Drive and Pistache
Lane was conducted over a 6 -year period between January 2015 to the most recent available
accident data, December 2020. There was a total of 2 accidents reported.
The driver of a vehicle approaching or departing from an intersection or driveway should have an
unobstructed view of the intersection, including any traffic control devices, and sufficient lengths
along the intersecting highway to permit the driver to anticipate and avoid potential collisions.
These unobstructed views form triangular areas are known as sight triangles. Any object within
the sight triangle that would obstruct the driver's view of an approaching vehicle should be
removed or modified or appropriate traffic control measures should be installed as per the
CAMUTCD. A parked vehicle extends approximately 7 -feet from the curb, so it is necessary to
consider the width of a vehicle when determining the amount of red curb needed to obtain a clear
sight triangle.
Per A Policy on Geometric Design of Highways and Streets (AASHTO) Table 3-1, for a roadway
with a posted speed of 35 MPH the clear sight distance needed is 250 feet. Please refer to the
below figures for the Stopping Sight Distance Triangle calculated for the amount of clear sight
that is needed for vehicles exiting from Pistache Lane onto Mission Drive.
City Traffic Commission Meeting
February 4, 2021
Page 3 of 4
Line of Sight Analysis for Turning Vehicles from Pistache Lane onto Mission Drive
Line of Sight Analysis for Turning Vehicles from Dubonnet Avenue onto Mission Drive
STAFF RECOMMENDATION
After a thorough review of existing field conditions, it was determined that red curb should be
installed along the northside curb of Mission Drive and Pistache Lane intersection to prevent
vehicles from parking at the corner. The additional of red curb will improve the line of sight for
vehicles exiting Pistache Lane onto Mission Drive. No additional red curb is suggested at the
Dubonnet Avenue location, the existing red curb provides adequate amount of clear line of sight
for exiting vehicles.
A detailed traffic report and proposed figure diagram is attached as Attachment A to this staff
report, please refer to Figure 8 of Attachment A for the properad diagram.
City Traffic Commission Meeting
February 4, 2021
Page 4 of 4
Below is a detailed list of the recommendations:
1. Install approximately 29 -ft of red curb along the north side of Mission Drive beginning
from the east side corner of Pistache Lane and Mission Drive. The additional red curb will
improve line -of -sight for left turning vehicles and will prevent vehicles from parking too
close to Pistache Lane.This will remove approximately 1 parking space along the north
side of Mission Drive, just east of Pistache Lane. Approximately 52 -feet of available
parking will remain to accommodate approximately 2 vehicles to park along the north side
of Mission Drive, just east of Pistache Lane.
2. Install approximately 12 -feet of red curb along the north side of Mission Drive beginning
from the west side corner of Pistache Lane and Mission Drive. The additional red curb will
improve line -of -sight for right turning vehicles and will prevent vehicles from parking too
close to Pistache Lane.
This will remove approximately 1 parking space along the north side of Mission Drive, just
west of Pistache Lane. 57 feet of available parking will remain to accommodate
approximately 3 vehicles to park along the north side of Mission Drive, just west of
Pistache Lane.
Prepared by:
Jana Robbins, Contract Traffic Engineering Division
Attachments:
A. Technical Engineering Report: Traffic Review of Mission Drive & Pistache Lane
B. Courtesy Notice to Residents
ATTACH M ENT A
TRANSTEch
TO: Chris Daste, Public Works Director
FROM: Traffic Engineering, Transtech Engineers, Inc.
DATE: January 22, 2021
SUBJECT: TRAFFIC REVIEW OF THE INTERSECTION OF MISSION DRIVE AND PISTACHE LANE
INTRODUCTION/BACKGROUND
The City of Rosemead received a request to review measures that would improve the line of sight for
vehicles turning left from Pistache Lane onto Mission Drive due to the view being obstructed by parked
vehicles on Mission Drive. On behalf of the City of Rosemead, engineering staff has completed a traffic
review to evaluate the intersection and recommend appropriate measures that would improve the line
of sight for vehicles turning from Pistache Lane entering traffic onto Mission Road. The traffic review
included an analysis of the existing roadway conditions, review of approximately 6 years of available
collision data, review of available average daily traffic counts, review of the documented 85"% of speed
on Mission Drive, as well as a line -of -sight analysis. The placement of all traffic control devices is dictated
by engineering judgment and based on guidelines found in the CAMUTCD (California Manual on Uniform
Traffic Control Devices) and the CVC (California Vehicle Code). Please refer to Figure 1 below for a vicinity
map of the subject location.
Figure 1: Vicinity Map
mow #i
i
r .
x�g
y Aye
dN
LEGEND Intersection of Interest:
INr
Mission Drive and Pistache Lane G
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CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 1 of 7
TRAFFIC REVIEW OF MISSION DRIVE AND PISTACHE LANE
Figure 2: Existing Conditions Map
r A
LEGEND
r a. N
Intersection of
. Interest: Mission Drive
at Pistache Lane
L
1 14
Stop (R1-1) Sign
i"5i
_ jY xor n Nat A Through Street
P
--� STREET" Sign
F
EXISTING CONDITIONS
Mission Drive: Mission Drive is an east/west arterial roadway per the City's Master Plan of Streets with a
posted speed limit of 35 MPH just east of Walnut Grove Avenue. This segment of Mission Street also has
posted school speed limit signage of "School 25 MPH When Children are Present" sign for eastbound
travel located approximately 105 -feet west of Muscatel Avenue. Mission Drive is approximately 63 -feet
wide, with two lanes in each direction and a solid double yellow centerline. Parking is allowed on both
sides of Mission Drive except along segments with "No Stopping Anytime" signs. There is no existing red
curb on either side of Pistache Lane as it intersects with Mission Drive, however there are existing red
curbs located east and west of Dubonnet Avenue as it intersects with Mission Drive. The Citywide speed
survey conducted for the City shows that the 85'h% of speed is at 36 MPH. Mission Drive carries about
19,000 vehicles per day. Land use is mainly a mix of Single Family Residential, church with some office.
The minor streets of Pistache Lane and Dubonnet Avenue are both cul-de-sac's and are stop controlled at
Mission Drive.
Pistache Lane: Pistache Lane runs north/south and is considered a residential local roadway per the City's
Master Plan of Streets with a prima facie speed limit of 25 MPH. Pistache Lane where it intersects with
Mission Drive is approximately 56 -feet wide and narrows down to 35 -feet with one lane in each direction
and no marked center line. Pistache Lane is a cul-de-sac. Pistache Lane is stop controlled at the
intersection with Mission Drive for vehicles heading southbound along Pistache Lane and is uncontrolled
in the east/west directions along Mission Avenue. In this area, Pistache Lane runs through a Planned
Development Residential zone with 12 houses with direct access.
Dubonnet Avenue: Dubonnet Avenue runs north/south and is considered a residential local roadway per
the City's Master Plan of Streets with a prima facie speed limit of 25 MPH. Dubonnet Avenue where it
intersects with Mission Drive is approximately 30 -feet wide and narrows down to 28 -feet with one lane
in each direction and no marked center line. Dubonnet Avenue is a cul-de-sac. Dubonnet Avenue is stop
�l.
OS �,.,�-Em
CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 2 of 7
TRAFFIC REVIEW OF MISSION DRIVE AND PISTACHE LANE
controlled at the intersection with Mission Drive for vehicles heading northbound along Du bonnet Avenue
and is uncontrolled in the east/west directions along Mission Avenue. In this area, Du bonnet Avenue runs
through a single-family residential zone.
PICTURE SUMMARY: EXISTING CONDITIONS
Dubonnet Ave'.
Eastbound along Mission Dr toward Pistache Ln
v,
a
a
a
c
c
'Mission
5
a
2
N
6
Southbound along Pistache Ln toward Mission Dr
CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 3 of 7
TRAFFIC REVIEW OF MISSION DRIVE AND PISTACHE LANE
COLLISION INVESTIGATION
Collision data was obtained from the computerized collision records system maintained by the State of
California called the Statewide Integrated Traffic Records Systems (SWITRS). A review of all collisions that
occurred within 100 -feet of the intersection of Mission Drive and Pistache Lane was conducted over a 6 -
year period between January 2015 to the most recent available accident data, December 2020. There was
a total of 2 accidents reported. A summary breakdown by year of the number of accidents at the studied
intersection is shown below and Figure 3 shows the Collision Diagram.
2020: 1 accident
2019: 0 accidents
2018: 0 accidents
2017: 0 accidents
2016: 1 accident
2015: 0 accidents
Table 1 provides a detailed list of the collisions within 100 -feet of Mission Drive and Pistache Lane.
Table 1: Summary of Collision History
No
Location
Dist.
Date
Collision
PCF
Severity
Factor
11111 y 1
•
Type
ly'�
5
MISSION DRAT
IMPROP
WBTHRU VEH HIT
1
65'W
5/26/20
HEAD-ON
INJURY
'
IP
DUBONNET AVE
•
o
z
TURN
EB PARKED VEH
MISSION DR AT
2
IMPROP
WB UNS TURN VEH
2
30'E
3/8/16
OTHER
I�-NI
PDO
PISTACHE LN
I
I
I TURN
I
I HIT PARKED VEH
According to the review of the collision history, there were 2 collisions within 100 -feet of the intersection
of Mission Drive and Pistache Lane within the 6 -year period. Both of the collisions a vehicle struck a parked
ca r.
Figure 3: Collision Diagram
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CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 4 of 7
LEGEND
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11111 y 1
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it
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Total
2
R.,
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P mperry Demege Only
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a'n
Total
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TOTAL
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CRASHES
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CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 4 of 7
TRAFFIC REVIEW OF MISSION DRIVE AND PISTACHE LANE
LINE OF SIGHT ANALYSIS
The driver of a vehicle approaching or departing
from an intersection or driveway should have an
unobstructed view of the intersection, including any
traffic control devices, and sufficient lengths along
the intersecting highway to permit the driver to
anticipate and avoid potential collisions (Maze and
Plazak 2000). These unobstructed views form
11 LOOM.
STREET
AREA TO BE CLEAE OP J I -
VIEW Gas THUCTNIN EDGE OF SHOULDER
\ �D r EDGE OF PAVEMENT
STATE HIGHWAY
triangular areas are known as sight triangles as seen — — — — — — — — — —
in Figure 4. Any object within the sight triangle that E
would obstruct the driver's view of an approaching vehicle should be removed or modified or appropriate
traffic control measures should be installed as per the Manual on Uniform Traffic Control Devices
(CAMUTCD). Obstructions within sight triangles could be buildings, vehicles, hedges, trees, bushes, tall
crops, walls, fences, or parked cars. A parked vehicle extends approximately 7 -feet from the curb, so it is
necessary to consider the width of a vehicle when determining the amount of red curb needed to obtain
a clear sight triangle.
Per A Policy on Geometric Design of Highways and Streets (AASHTO) Table 3-1, for a roadway with a
posted speed of 35 MPH the clear sight distance needed is 250 feet. Table 2 below summarizes the
Stopping Sight Distance based on design speeds and Figure 4 above presents an example of a clear sight
triangle at an intersection. Figure 5 below shows an Example of Stopping Sight Distance Triangle with
Vehicles Parked Along Curb and Figure 6 shows the calculated amount of clear sight that is needed for
vehicles exiting from Pistache Lane onto Mission Drive.
Table 2: Stopping Sight Distance
Design
Speed
(MPH)
Brake reaction
distance
(ft)
Braking distance on
level
(ft)
Stopping Sight Distance
Calculated
(ft)
Design
(ft)
25
91.9
60.0
151.9
155
30
110.3
86.4
196.7
200
35
128.6
117.6
246.2
250
40
147.0
153.6
300.6
305
45
165.4
194.4
359.8
360
Note: Brake reaction distance predicated on a time of 2.5s; deceleration rate 11.2 ft/sec'
CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 5 of 7
TRAFFIC REVIEW OF MISSION DRIVE AND PISTACHE LANE
Figure 5: Example of Stopping Sight Distance Triangle with Vehicles Parked Along Curb
Vehicle obstructing view
Min V distance for vehicle
clearance
Area to be clear of view
obstruction
Figure 6: Line of Sight Analysis for Turning Vehicles from Pistache Lane onto Mission Drive
It
Line OT Jlgnt Analysis Tor I urning VenicieS rrom uUDOnnet Avenue onto mission urive
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CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 6 of 7
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- - -
C
It
Line OT Jlgnt Analysis Tor I urning VenicieS rrom uUDOnnet Avenue onto mission urive
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CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 6 of 7
TRAFFIC REVIEW OF MISSION DRIVE AND PISTACHE LANE
After a thorough review of existing field conditions, it was determined that red curb should be installed
along the northside curb of Mission Drive and Pistache Lane intersection to preventvehicles from parking
at the corner. The additional of red curb will improve the line of sight for vehicles exiting Pistache Lane
onto Mission Drive. Please refer to Figure 8 for a visual demonstration of the proposed conditions. No
additional red curb is suggested atthe DubonnetAvenue location, the existing red curb provides adequate
amount of clear line of sight for exiting vehicles.
Recommendations
1. Install approximately 29 -ft of red curb along the north side of Mission Drive beginning from the east
side corner of Pistache Lane and Mission Drive. The additional red curb will improve line -of -sight for
left turning vehicles and will prevent vehicles from parking too close to Pistache Lane.
a. This will remove approximately 1 parking space along the north side of Mission Drive, just
east of Pistache Lane. Approximately 52 -feet of available parking will remain to accommodate
approximately 2 vehicles to park along the north side of Mission Drive, just east of Pistache
Lane.
2. Install approximately 12 -feet of red curb along the north side of Mission Drive beginning from the
west side corner of Pistache Lane and Mission Drive. The additional red curb will improve line -of -sight
for right turning vehicles and will prevent vehicles from parking too close to Pistache Lane.
a. This will remove approximately 1 parking space along the north side of Mission Drive, just
west of Pistache Lane. 57 feet of available parking will remain to accommodate
approximately 3 vehicles to park along the north side of Mission Drive, just west of Pistache
Lane.
Figure 8. Proposed Recommendations: Aerial View
' O FMFAD
CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 7 of 7
I,^
Paint Approximately 29 -ft
_
of red curb to improve
V
line of sight.
Approximately 52 -feet of
-
parking will remain for
Paint Approximately
12
-ft of
lz,
approximately 2 vehicles
red curb to improve
line of
�,--_"
to park alongthe
sight. Approximately
57
-feet of
_%;
northside of Mission
parking will
remain
for
..`+
Drive,just east of
approximately
3 vehicles
to
"..
O
Pistache Lane.
park along the
northside
of
Zs -
Mission Drive
just west
of
Pistache
' O FMFAD
CITY OF ROSEMEAD
Prepared By: Transtech Engineers, Inc. I Page 7 of 7
ATTACHMENT�BB
OSE EA�D
Tcuffic Commfssion Courtesy Notification
NOTICE IS HEREBY CIVENtwt ®Thursday, Febmary4,2021, atthehour of9:00 pm., or soon thereafter as the matter maybe heard
the Rosemead Traffic Comm is don will hold a public meeting in the Council Chambers at City Hall fm the purpose of reviewingthe Traffic
Conditions on Miss on Drive at Pistache Lura.
To adhereto the Los Angeles County Health Officer x updated Lane 11, 2020, Revised Safer atHome Order, Uusmeendwtll beheld via
teleconference andthe public will have access to observe the mecandid Thom cally by calling I@6d 866 4999, Code ID 6163-10-9205
mat wwwcity fiosemeadorg to watch online Please note that, in accordance with GovemorNewsom s Execwive Order N2920 and
Nr 3520, thea will net be aphydcal locatonfrom wnlah Ne public may attend
You are bein,gnotihed of this meeting because your property is willtinproximity to the locaton We encourage you comments regarding
traffic safety in has area Citizenswishing to comment may do so by calling (620 5692100 or via canal at
publizzmmment@ciryofiosemeadorg1by5:GG pm. Please identify Ne topic youwishm zommeminyour emvPs mbjeztline All zommems
are public record and will be recondedinthe official record of the City. Wnttenzommmtsmus he addassedtc
City of Rosemead
Public Works DePmtment
8838E. Valley Boulevard
Rosemead Cal6omla91990
Attendom On Cluis Dana, Director of Public Works
A -p m only commemsreceivedby5:00 pm. onTlrusday, Febmary, 4,2021, will be accepted We appamiateyour e®vemfortraffic safety
m ineCity of Rosemead SMnldyou have any questions regmdingthis letter, please contralto Director of Public Wodz Chris DaA6 at
626-5692158.
Porinformationplease call
Pura obtenermdsidormaci6m favor de Timor N
Df bi@LLhfm elv t€t xin gai:
626 569 2150
Pmpused CuadiemPiwheLamatMi nDme
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park along the mrthside of
Mission Drive, just wart of
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