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
Interstate 15 Bus Rapid Transit
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)
Interstate 15 Bus Rapid Transit
I-15 BRT Extension: Mira Mesa Blvd Route
Interstate 15 Bus Rapid Transit
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
Interstate 15 Bus Rapid Transit
Traditional Transit-Priority Option
Interstate 15 Bus Rapid Transit
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
Interstate 15 Bus Rapid Transit
Dedicated lane concept at an intersection (Transit jump and mixed turn)
Determination of shared and dedicated lane lengths
Traditional Transit-Priority Measures
Interstate 15 Bus Rapid Transit
Traditional Transit-Priority MeasuresContinuous designated shared travel lane
Shared lane concept at an intersection (Transit jump and mixed turn)
Interstate 15 Bus Rapid Transit
Traditional Transit-Priority MeasuresFar-side bus stop turn-outs with a traffic interrupter
Far-side bus stop turn-outs with an acceleration lane
Interstate 15 Bus Rapid Transit
Traditional Transit-Priority Locations
Interstate 15 Bus Rapid Transit
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
Interstate 15 Bus Rapid Transit
Sample Layout:•Black Mountain Road and Mira Mesa Blvd
Traditional Transit-Priority Option
Interstate 15 Bus Rapid Transit
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)
Interstate 15 Bus Rapid Transit
Two Phase Enhanced At-Grade Intersection System (2PI)
Two Phase Intersection Option
Interstate 15 Bus Rapid Transit
•Divide the intersection
•Advance left turn crossover
•Eliminate left turn conflicts at main intersection
Two Phase Intersections – The Concept
Advance Intersection
Main Intersection
Interstate 15 Bus Rapid Transit
Main Intersection
Two Phase Intersections – The Concept
Interstate 15 Bus Rapid Transit
Two Phase Intersection – How does it work?
Interstate 15 Bus Rapid Transit
Conventional Intersections vs. 2PI
1
2
3
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!
Interstate 15 Bus Rapid Transit
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
Click page down button on keyboard when symbol
below appears.
to here.
It will take two phases
A wishes to cross from
here
PHASE 1
A
PHASE 2
A
to here
It will take two phases
B wishes to cross from
here
PHASE 1
B
PHASE 2
B
It will take three phases
wishes to cross from
here
C
to here.
C
Phase 1
Phase 2
C
Phase 3
C
2 Phase IntersectionThree typical crossing examples animated simultaneously.
2 Phase IntersectionThree typical crossing examples animated simultaneously.
A C
B
Phase 1
Phase 2
Phase 3
End
Interstate 15 Bus Rapid Transit
•Several refuge islands
•Right turn crossing protected by signal
•Standard ADA measures
•Bicycles accommodated–Same as conventional
2PI – Pedestrians (Refuges) & Bicycles
Interstate 15 Bus Rapid Transit
Studied in Detail
2PI Option – Mira Mesa Locations
Interstate 15 Bus Rapid Transit
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
Interstate 15 Bus Rapid Transit
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
Interstate 15 Bus Rapid Transit
Interstate 15 Bus Rapid Transit
Key Features of OptionsTraditional Transit-Priority
&Two Phase Intersection (2PI)
Improvements
Interstate 15 Bus Rapid Transit
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)
Interstate 15 Bus Rapid Transit
Interstate 15 Bus Rapid Transit
Common Features
•Increased transit reliability and speed•Right-of-Way
– Additional ROW needed at intersections– No building impacts anticipated
Interstate 15 Bus Rapid Transit
•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)
Interstate 15 Bus Rapid Transit
•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
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
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
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
Camino Ruiz•Third most congested intersection along Mira Mesa Boulevard
Travel Time
Morning Peak Hours
Afternoon Peak Hours
Level of Service
Two Phase Savings
-78% -54%E → B (AM)D → C (PM)
2PI Project Investigation
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
Reagan Rd East
(New Salem St)
•East of Camino Ruiz
•Residential area
•Near Mira Mesa High School
Travel Time
Morning Peak Hours
Afternoon Peak Hours
Level of Service
Two Phase Savings
-59% -24% D → C (AM)
2PI Project Investigation
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
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
Afternoon Peak Hours
Level of Service
Two Phase Savings
-83% -85% F → B
2PI Project Investigation
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
Westview Parkway
•Congested major intersection
•Commercial Area
•West of I-15Travel Time
Morning Peak Hours
Afternoon Peak Hours
Level of Service
Two Phase Savings
-68% -77%D → B (AM)F → B (PM)
2PI Project Investigation
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
I-15 Ramps•Heavy Traffic•Ramp Meters
Travel Time
Morning Peak Hours
Afternoon 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)
2PI Project Investigation
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
Scripps Ranch Blvd•Close proximity to Caltrans right-of-way
•T-intersection–Non-standard
Travel Time
Morning Peak Hours
Afternoon Peak Hours
Level of Service
Two Phase Savings
-40% -48% D → C (AM)
2PI Project Investigation
Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection
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