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

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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

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Light Rail Transit Facilities Design Course

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Channelization of Pedestrian Crossings

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Roadway Interfaces & Traffic Engineering 27

Standard Detail of Typical Ped Z-Crossing