2pi + b r t city of san diego

Interstate 15 Bus Rapid Transit (BRT)

March 2009

Interstate 15 Bus Rapid Transit

Presentation Outline•Background•Overview of two options–Traditional Transit-Priority–Two Phase Intersections (2PI)

•Features of each option•Recommendations •Questions and discussion


Background•Extend I-15 BRT to Sorrento Mesa, University City, and UCSD•Operations Study completed (TMD)

–Carroll Canyon Road still being studied

•Mira Mesa Boulevard is most viable route–Centrally located–Direct route to serve Sorrento Mesa–One-third of ridership from Sorrento Mesa area

•Congestion reduces BRT effectiveness–Identify potential solutions (improvements)


I-15 BRT Extension: Mira Mesa Blvd Route


Project•Provide viable BRT service along Mira Mesa Boulevard

•Two concepts studied for improvements– Traditional Transit-Priority

improvements– Two Phase Intersection (2PI)

improvements

•Seeking consensus on alternatives for Environmental Document


Traditional Transit-Priority Option


Traditional Transit-Priority Approach•Studied various Transit-Priority measures•Pared to several potential improvements:–Dedicated queue jump thru/turn lanes–Continuous shared lanes–Far side bus-stop turn outs–Signal coordination/Green time extension

•Identified improvement locations by:–Most congested on Mira Mesa Boulevard (2030

volumes)–Provide highest potential benefit to transit–City (Steve C), SANDAG and MTS input


Dedicated lane concept at an intersection (Transit jump and mixed turn)

Determination of shared and dedicated lane lengths

Traditional Transit-Priority Measures


Traditional Transit-Priority MeasuresContinuous designated shared travel lane

Shared lane concept at an intersection (Transit jump and mixed turn)


Traditional Transit-Priority MeasuresFar-side bus stop turn-outs with a traffic interrupter

Far-side bus stop turn-outs with an acceleration lane


Traditional Transit-Priority Locations


Traditional Transit-Priority Locations

Intersection Recommended ImprovementsBlack Mountain Road (DAR at Hillery)

Extend existing left and right-turn pocketsBlack Mountain Road (DAR at Galvin)

Black Mountain Road (No DAR)Dedicated lane concept with a transit queue jump and far-side bus stop turn-outs

Reagan Road EastDedicated lane concept with a transit queue jump; with continuous shared lane and far-side bus stopInterim: Shared lane at Reagan East EB and Reagan West WB

Camino Ruiz

Reagan Road West

Camino Santa Fe

Pacific Heights BoulevardConvert one of two existing southbound thru lanes to a dedicated transit left-turn queue jump lane

Scranton RoadDedicated transit right-turn queue jump on southbound Scranton Road

Interstate 805Dedicated transit left-turn lane (westbound) from the center median across eastbound lanesNote: Better transit access to southbound on-ramp


Sample Layout:•Black Mountain Road and Mira Mesa Blvd

Traditional Transit-Priority Option


Traditional Transit-Priority Summary

•Travel Time Savings (whole corridor)– Transit benefit only– Morning peak direction (WB): 2.9 minutes (vs. No-

Build)•1.5 minutes from I-805 location

– Evening peak direction (EB): 1.8 minutes (vs. No-Build)

•Estimated Costs– Between $13.5 and $15.5 million– Between $1.5 and $2.5 million per intersection

•Alternative intersection concept

•Higher capacity

•Metropolitan Mobility Technologies Corp (MetTra)


Two Phase Enhanced At-Grade Intersection System (2PI)

Two Phase Intersection Option


•Divide the intersection

•Advance left turn crossover

•Eliminate left turn conflicts at main intersection

Two Phase Intersections – The Concept

Advance Intersection

Main Intersection


Main Intersection

Two Phase Intersections – The Concept


Two Phase Intersection – How does it work?


Conventional Intersections vs. 2PI

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2

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4

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Conventional–4-6 lanes flowing–More red time–Limited capacity

2PI System–6-10 lanes flowing–More green time–Much more capacity!


2PI – Case History (Variations)Similar cases in United States•Other variations

–Left turn separation

2PI variation completed in 2006 on Airline Road in Baton Rouge, Louisiana

NOTE: In 2002, 2PI concept received AASHTO’s "Francis B. Francois Award" in recognition of its contribution to transportation

2 Phase IntersectionThree typical crossing examples.

2 Phase IntersectionThree typical crossing examples.

A B C

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below appears.

to here.

It will take two phases

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to here

It will take two phases

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It will take three phases

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to here.

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2 Phase IntersectionThree typical crossing examples animated simultaneously.

2 Phase IntersectionThree typical crossing examples animated simultaneously.

A C

B

Phase 1

Phase 2

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•Several refuge islands

•Right turn crossing protected by signal

•Standard ADA measures

•Bicycles accommodated–Same as conventional

2PI – Pedestrians (Refuges) & Bicycles


Studied in Detail

2PI Option – Mira Mesa Locations


Black Mountain Road•Most congested intersection–Forecast (year 2030):

•7,573 vehicles per hour (AM)•9,201 vehicles per hour (PM)

•Along DAR Access Route

Level of Service

Two Phase Savings F → B

2PI Option – Single Location Detail


AM Travel Time Westbound Avg. Speed

No-Build 11 min. 8 mph

Two phase 5 min. 26 mph

Two Phase Savings -6 min. +18 mph

PM Travel Time Eastbound Avg. Speed

No-Build 11 min. 9 mph

Two phase 5 min. 26 mph

Two Phase Savings -6 min. +17 mph

Year 2030 AM Travel Times: No-Build vs. 2PI

Year 2030 PM Travel Times: No-Build vs. 2PI

2PI Option – Traffic Data Summary

Summary

•Total travel time savings– Morning peak direction (WB): 6 minutes (vs. No-Build)– Evening peak direction (EB): 6 minutes (vs. No-Build)– Benefit to all modes of travel– Black Mountain Road has most benefit (85%)

•Estimated Costs– Six thru lanes: $40 million (7 intersections)

•Includes ~$20 million for ROW– Four thru lanes: substantially less

•Requires less ROW



Key Features of OptionsTraditional Transit-Priority

&Two Phase Intersection (2PI)

Improvements


Features: Traditional transit-priority

•Travel time benefit primarily for transit•Maintains LOS (mixed flow)•Familiar driver, bicycle, and pedestrian patterns•Minor transit stop differences•No access changes (driveway turns)

Features: Two Phase Intersection (2PI)

•Travel time benefit for transit and general traffic•Improves LOS to C or better (transit & mixed flow)•New driver, pedestrian, and bicycle patterns•Transit stop locations more limited•Some access changes near intersections (driveway turns)



Common Features

•Increased transit reliability and speed•Right-of-Way

– Additional ROW needed at intersections– No building impacts anticipated


•Both 2PI and Traditional Transit-Priority options are feasible

•Cost/Benefit is proportional:

Findings

Travel Time Savings (Peak Direction)Total Cost

Westbound (AM) Eastbound (PM)

Transit-priority

2.9 min. (entire corridor)1 min. (eastern segment)

1.8 min. (entire corridor)1.2 min. (eastern segment)

$13.5-15.5 million (entire corridor)$5.5 million (eastern segment)

Two phase6 min. (entire corridor)

5.8 min. (eastern segment)6 min. (entire corridor)

5.7 min. (eastern segment)$40 million (entire corridor)

$32 million (eastern segment)


•Include both options in Mira Mesa Blvd BRT Environmental Document as alternatives

•Study both in detail for whole corridor – For 2PI, study four and six-lane options

•Coordinate with the City of San Diego throughout the process

Recommendations

Mira Mesa Boulevard: Traditional Transit-Priority

Transit-Priority Level of Service Data

Intersection Level of Service

Black Mountain Road (DAR at Hillery)F → E (AM)F → E (PM)

Black Mountain Road (DAR at Galvin)

Black Mountain Road (No DAR)

Reagan Road EastF → E (AM)E → D (PM)

Camino RuizD → D (AM)F → E (PM)

Reagan Road WestF → E (AM)E → E (PM)

Camino Santa FeE → E (AM)F → D (PM)

Pacific Heights BoulevardD → D (AM)F → E (PM)

Scranton RoadE → E (AM)F → F (PM)

•LOS Maintained

Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection

2PI Details


Reagan Road West

•West of Camino Ruiz

•Commercial area

Travel Time

Morning Peak Hours

Afternoon Peak Hours

Level of Service

Two Phase Savings

-69% -65%C → A (AM)D → B (PM)

2PI Project Investigation


Camino Ruiz•Third most congested intersection along Mira Mesa Boulevard

Travel Time

Morning Peak Hours


Level of Service

Two Phase Savings

-78% -54%E → B (AM)D → C (PM)



Reagan Rd East

(New Salem St)

•East of Camino Ruiz

•Residential area

•Near Mira Mesa High School

Travel Time

Morning Peak Hours


Level of Service

Two Phase Savings

-59% -24% D → C (AM)



Black Mountain Road•Most congested intersection–Forecast (year 2030):

•7,573 vehicles per hour (AM)•9,201 vehicles per hour (PM)

•Along DAR Access Route

Travel Time

Morning Peak Hours


Level of Service

Two Phase Savings

-83% -85% F → B



Westview Parkway

•Congested major intersection

•Commercial Area

•West of I-15Travel Time

Morning Peak Hours


Level of Service

Two Phase Savings

-68% -77%D → B (AM)F → B (PM)



I-15 Ramps•Heavy Traffic•Ramp Meters

Travel Time

Morning Peak Hours


Level of Service

Two Phase Savings

I-15 NB -37% -84%C → B (AM)F → B (PM)

I-15 SB -78% -32%E → B (AM)C → B (PM)



Scripps Ranch Blvd•Close proximity to Caltrans right-of-way

•T-intersection–Non-standard

Travel Time

Morning Peak Hours


Level of Service

Two Phase Savings

-40% -48% D → C (AM)



2PI Level of Service Data

Intersection Level of Service

Reagan Road WestC → A (AM)D → B (PM)

Camino RuizE → B (AM)D → C (PM)

Reagan Road East (New Salem) D → C (AM)

Black Mountain Road F → B

Westview ParkwayD → B (AM)F → B (PM)

I-15 NBC → B (AM)F → B (PM)

I-15 SBE → B (AM)C → B (PM)

Scripps Ranch Boulevard D → C (AM)

•LOS Improved

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