Download - W2b roadway byrne
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 05.11.2010 & 05.12.2010
Bill Byrne, DEA
Dan Sosnovoske, Tri-Met
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Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 3
Overview
• Right-of-way types • Alignment types • Types of protection • Traffic and pedestrian
considerations • Grade separate? • Example functional layouts • Intersection and crossing design • Traffic control strategies and
systems • Signing and signal indications • Resources
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 4
Right-of-Way Types - TCRP 17
Exclusive
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 5
Right-of-Way Types
Semi-exclusive - separate ROW
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 6
Right-of-Way Types
Semi-exclusive shared ROW with curbs and/or fences
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 7
Right-of-Way Types
Semi-exclusive shared ROW with striping or mountable curbs
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 8
Right-of-Way Types
Non-exclusive mixed traffic
Portland Streetcar
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 9
Right-of-Way Types
Non-exclusive transit or pedestrian/transit mall
Sacramento LRT
Buffalo NY LRT
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 10
Alignment Types
Semi-exclusive -Median
Boston Green Line
VTA San Jose
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 11
Alignment Types
Semi-exclusive side of street -single track (with flow)
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 12
Alignment Types
Semi-exclusive side of street - single track (contra-flow)
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 13
Alignment Types
Semi-exclusive side of street single track (reversible)
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 14
Alignment Types
Semi-exclusive side of street single track (reversible)
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 15
Alignment Types
Semi-exclusive side of street double track
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 16
Alignment Types
Semi-exclusive side of street double track
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 17
Traffic and Pedestrian Interfaces
Depend on Right of Way Type
• None for Exclusive (all RRT, some CR, some LRT)
• Limited for Semi-exclusive (CR and LRT)
• Extensive for non-exclusive (LRT)
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 18
Types of Protection
Crossings
• Passive signs
• Active signs
• Traffic signals
• Gates
• Warning devices
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 19
Traffic and Pedestrian Considerations
• Pedestrian safety
• Pedestrian access to system and adjacent properties
• Traffic safety
• Vehicular access to adjacent properties
• Traffic capacity and flow
• LRT travel time
• LRT reliability
• Passenger safety
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 20
Key Issues
• Turning vehicles
• Crossing vehicles
• Pedestrians
• Start-up
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 21
Should You Grade Separate?
Factors
• Roadway functional class and speed
• Roadway traffic volumes
• LRT headways
• LRT operating speed
• Type of traffic control
• Operating environment
• Urban design
• Cost
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 22
ITE Informational Report
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 23
DART Guidelines (1992)
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 24
Interfaces with Pedestrians
• Sight distance
• Channelization
• Crossing gates
• Bikes, wheel chairs, high heels
• Pedestrian bridges
• Development interfaces
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 25
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 26
Channelization of Pedestrian Crossings
Light Rail Transit Facilities Design Course
Roadway Interfaces & Traffic Engineering 27
Standard Detail of Typical Ped Z-Crossing