Purple Line Extension
Draft Traffic Management Plan (TMP), La Brea Station Decking Full Closure
January 11, 2016
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Agenda
● Introduction, Decking Schedules, TMP
● Study Intersections, Existing Volumes
● Detours, Feasibility
● Trip Distribution, Projected Traffic
● Mitigations, Implementation
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La Brea Station Decking
Process for Schedule Determination
● August 2015: Outreach to businesses and residents, La Brea to Highland
● September 17, 2015: Presentation to Community
● September – November 2015: Outreach continues to businesses and residents and
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includes local organizations, homeowner associations, neighborhood councils.
November 12, 2015: Interest in Alternative Schedule requires TMP
January 11, 2016: Community Meetings to discuss findings of draft TMP
January 21, 2016: Construction Community Meeting, LA High School
January/February 2016: Approval from LA City agencies (DOT, BOE, BSL, BSS) on TMP
and other required submittals, in order to pursue Alternative Schedule
March 2016: Final approval from Board of Public Works on Alternative Schedule
Spring 2016: La Brea Decking begins (dependent on pile production and weather)
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La Brea Station
Decking Layout
Purple: Weekends Only
La Brea to Detroit
• 3 weekends, Detroit to La Brea
• 3 weekends, La Brea intersection
Green: Baseline Schedule v. Alternative
Highland to La Brea
• Alternative: 7 full weeks
• Baseline: 16 weekends
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La Brea Station
Decking, Baseline Schedule
Baseline Schedule
● Approximately 16 weekend closures
− 9pm Friday thru 6am Monday, work continuous
− 48 nights/32 days of work for 55/hr weekends
85 days of work Monday−Friday 7am−11pm
● No TMP
● No Peak Hour Exemption
● Requires approval from Board of Public Works
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La Brea Station
Decking, Alternative Schedule
Alternative Schedule
● 7 week full closure of Wilshire, from Highland to La Brea
− 7 days a week, 7am−11pm above deck, 11pm−7am below deck
− 49 nights/49 days of work
● The extent of the closure (during peak hours) requires LADOT approval of a TMP
● Design & engineering of mitigations for traffic signals need to start January 22, 2016
● Requires Peak Hour Exemption by BOE
● Requires approval from Board of Public Works
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What is a Traffic Management Plan (TMP)?
A Traffic Management Plan is a site-specific plan that covers the design,
implementation and maintenance of temporary traffic management during a
construction work activity. The following information is from the draft
TMP for the 7-week full closure that has been submitted to LADOT and
is pending approval. The TMP includes, but is not limited to,
• Current Traffic Counts
• Trip distribution along detour routes
• Detour routes
• Mitigations for detour routes
• Contingencies
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Traffic Counts
Traffic Counts were conducted on:
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Thursday, November 19, 2015
Saturday, November 21, 2015
Sunday, November 22, 2015
Two types of counts:
1. Turning and through movement counts (AM and PM peak hours)
a. Taken at 22 locations
2. Average Daily Traffic (ADT) Volumes
a. Taken at 5 locations
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Intersections
Study Intersections:
The following 22 intersections were considered as a part of Wilshire Blvd. closure and
new traffic counts were conducted at all of these intersections.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Fairfax & 3rd
La Brea & 3rd
Highland & 3rd
Wilton & 3rd
Western & 3rd
Fairfax & 6th
La Brea & 6th
Highland & 6th
San Vicente & Wilshire
Fairfax & Wilshire
La Brea & Wilshire
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November 2015 Average Daily Traffic (ADT)
Volumes: Weekdays, Weekends
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Detours
1. Primary Detours:
Primary detours will direct motorists along major thoroughfares as motorists approach the
closure. Intersections along these routes will require major mitigations and signage.
2. Alternate Detours:
Motorists will be advised to use alternate routes at junctures well in advance of the closure. For
example, motorists westbound on Wilshire will be encouraged to utilize alternate routes starting
at Western. Intersections and streets along the alternate detour routes will also require
mitigations and signage.
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DRAFT PRIMARY DETOUR, WESTBOUND
1. Westbound Primary Detour:
a. Soft closure: WB Wilshire, SB Crenshaw, WB Olympic, NB La Brea,
WB Wilshire
b. Hard Closure: WB Wilshire, SB Highland, WB Olympic, NB La Brea,
WB Wilshire
2. Westbound Alternate Detours:
a. WB Wilshire, NB Western, NB Wilton, WB 3rd, SB Fairfax
b. Stay on WB Olympic, NB San Vicente, WB Wilshire
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DRAFT PRIMARY DETOUR, EASTBOUND
1. Eastbound Primary Detour:
rd
a.Soft closure: EB Wilshire, NB Fairfax , EB 3 rd, SB Western, EB Wilshire
b. Hard closure: EB Wilshire, SB La Brea, EB Olympic, NB Crenshaw, EB Wilshire
2.Eastbound Alternate Detour
a.EB Wilshire, NB La Brea, EB 3 rd, SB Wilton, EB Wilshire
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Additional Studied Detour Routes Determined Unfeasible
Eastbound Wilshire:
1. EB Wilshire, SB San Vicente, EB Olympic
Issue 1: No left turn permitted onto EB Olympic from SB San Vicente
Issue 2: SB San Vicente, NB La Brea = too far a distance to constitute a workable detour
2. EB Wilshire, NB La Brea, EB 6, SB Highland
th
Issue: Too much congestion on 6 th and Highland
Westbound Wilshire:
1. WB Wilshire to NB Highland
Issue 1a: No Left turn permitted from NB Highland to WB 3rd or 6th during peak hours
Issue 1b: No existing left turn pocket from WB Wilshire to NB Highland
Issue 2: Too impactful to existing traffic to create left turn pockets at Highland/6th and Highland/3rd
because of existing parking and medians.
2. WB Wilshire to NB Western or NB Wilton to WB 6
Issue: Too much congestion on 6th
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Projected Trip Distribution
Projected trip distribution is an estimate of the
percentage of vehicles that will use individual
detour routes. Projected trip distribution is
derived from the current traffic conditions,
counts and the Level Of Service (LOS) analysis
at individual intersections.
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WESTBOUND TRIP DISTRIBUTION
Trip Distribution Projections
1. Primary Westbound Detour:
a. 30% takes SB Crenshaw
b. 40% takes SB at Highland
2. Alternate Westbound Detour
a. 10% takes NB Western
b. 10% takes NB Wilton
10% of traffic avoids the area with marketing and community outreach
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EASTBOUND TRIP DISTRIBUTION
Trip Distribution Projections
1. Primary Eastbound
a. 20% takes NB Fairfax
b. 40% takes SB La Brea
2. Alternate Eastbound
a. 10% takes SB San Vicente
b. 20% takes NB La Brea
10% of traffic avoids the area with marketing and community outreach
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Proposed Mitigations IN TMP
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Signal Timing/Coordination Improvements
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Street/Intersection Striping Modifications (adding and lengthening left turn pockets)
Traffic Officers
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Additional Traffic Surveillance Cameras
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Parking Restrictions
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Contingency Mitigations
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Public Information Strategies
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Intersection Level Of Service (LOS) Summary
Level Of Service (LOS) analysis provides a
letter grade for intersections based on the
amount of time it takes to drive through that
intersection.
Table 9 shows the LOS summary for the
intersections that require mitigations. This
table includes the delay in seconds per
vehicle and the corresponding letter grade.
The table shows the preexisting grade
(“Base” column), the grade with the 7-week
full closure (“Closure” column) , and the
grade under closure with mitigations
(“Mitigations” column).
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MITIGATION LOCATIONS
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Mitigation Summary Table by
Intersection
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Mitigation Summary Table by
Intersection Cont.
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Mitigation Summary Table by
Intersection Cont.
Intersection
Crenshaw/Wilshire
Wilton/Wilshire
La Brea/Olympic
Highland/Olympic
Crenshaw/Olympic
Proposed Mitigation
−Convert #1 westbound through lane to a left
turn lane
−Convert westbound bus lane to a through
lane
−Modify signal timingƒphasing
−Add protectiveƒpermissive southbound left
turn phasing
−Extend southbound left turn pocket lane
−Eliminate north leg of crosswalk
−Remove parking alongside the Northside of
Olympic between La Brea Ave. and Highland
−Modify signalƒtiming phasing
−Extend eastbound left turn pocket
−Eliminate west leg of crosswalk
−Install ATSAC camera
−Modify signal timing phasing
Impacts
−Potential delay andƒor
relocations for
westbound buses
−Extend eastbound left turn pocket
−Extend northbound left turn pocket
−Modify signal timing
−Removal of
approximately 115’ of
two way left turn lane
west leg. Removal of
approximately 100’ of
two way left lane north
leg.
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−Removal of parking
between La Brea and
Highland on Olympic
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Implementation and Contingency
● During the first two weeks of the closure, the effectiveness of
the mitigations and the traffic would be closely monitored.
• At that time, STS and Metro would work with DOT to
make adjustments based on analysis in the field and use
any contingency plans available.
• STS and Metro would continue to work closely with DOT
throughout the duration of the closure.
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La Brea Station Decking
Community Outreach
Robust Marketing Campaign
Social Media: Facebook, Twitter
Advertising: Newspapers, radio
Media Coverage: Press Release, event
Business and resident outreach
Meetings with local groups, leaders
Elected Official Briefings
Safety Presentations
School Presentations
Community Partnerships
Eblast, Walking Man
I-405 Freeway Closure “Carmageddon”
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Stay in Touch
www.metro.netƒpurplelineext
twitter.comƒpurplelineext
facebook.comƒpurplelineext
213.922.6934
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