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Design Considerations for BRT Level Boarding
Station Platforms
Christopher Hemmer, PESupervising EngineerParsons Brinckerhoff
Portland, Oregon
QUALITY TRANSIT -- NOW
2009 Bus Rapid Transit Conference2009 Bus Rapid Transit Conference
Isabella Bejarano, PELead Engineer
Parsons Brinckerhoff Portland, Oregon
What is Level Boarding?
• The boarding areas are designed to provide horizontal and vertical gaps compliant with ADA requirements or easily traversed with a short bridgeplate.
• Platform heights of 10 inches or greater
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Why Level Boarding is Advantageous
• Reduced Dwell Times• Improved Accessibility• System Branding
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Docking Technologies
• Precision Guidance Techniques:
Special CurbsMechanical GuidanceElectronic Guidance
• Manual Docking
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Methodology
• Turning Templates – Turning templates were generated using AutoTurn version 6 software from Transoft Solutions
• Bus models – Most modeling efforts used a custom generated template based on the New Flyer BRT articulated vehicle (63- foot length) in use in Eugene, Oregon and Cleveland, Ohio.
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Bus Pullouts
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Approach Considerations
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Approach Length vs. Rear Door Gap
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Vehicle Gap (ft) at Rearmost Door 40-ft Bus
(40-ft Platform) Articulated BRT (60-ft Platform)
Platform Approach Tangent Length
(ft) To
Platform
Difference with Front
Door To
Platform
Difference with Front
Door 0 1.80 1.55 2.05 1.80
10 1.48 1.23 1.47 1.22 20 1.04 0.79 1.20 0.95 30 0.80 0.55 0.83 0.58 40 0.58 0.33 0.53 0.28 50 0.46 0.21 0.39 0.14 60 0.35 0.10 0.34 0.09
* Front door gap equals 0.25 feet (3 inches)
Departure Considerations
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Springfield Transit Station
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Springfield Transit Station
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Dedicated EmX BRT Bay
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Level Boarding Platform
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Deployed Ramp
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Level Boarding Platform Design Considerations
• Vehicle • Turning Movements • Defined Layout Limits • Clearance Considerations
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Clearance Considerations
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Departure Maneuver Conflict
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Platform Configurations
• Superstop
• Sawtooth
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Recommended Sawtooth Geometry
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Sawtooth Configuration for Level Boarding
Platforms (3” vehicle gap)
Sawtooth Taper Rate
(1:X)
Sawtooth to Vehicle Ratio
(1:D)
Length (L) (lin. ft)
Tangent Length (T)
(lin. ft) 1:1 0.59:1 13 37.25 2:1 1.18:1 26 24.25 3:1 1.77:1 39 11.25 4:1 2.36:1 52 0 5:1 2.96:1 65 -0.49*
Springfield Transit Station – Lessons Learned
• Sawtooth Configuration• Vehicle Characteristics• 3D • Bellows• Bus Test
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Next Steps
• Data gathering
• Expand model
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