Bus Queue Jump Signals

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Purpose 

Allows buses to easily enter traffic flow in a priority position.

Description

Bus queue jump signals provide either a leading bus interval (a dedicated bus signal that turns green before general traffic signals) or active signal priority to buses (extending the time for green signal when a bus is nearby) in a short, dedicated transit lane or shared transit/turn lane. Bus queue jumps can reduce delay, increase safety for buses merging with traffic, and offer increased reliability and run-time savings.

Safety Benefits

Allows buses to merge with traffic more easily.

Street Types and Context

Applicable Street Types

Principal Arterial Streets and some Minor Arterial Streets where signals are present.

Other Location Guidance 

  • Bus queue jumps can be applied at near-side bus stops. At near-side pullout stops, the bus completes loading before rolling forward onto a loop detector that activates the bus signal.
  • Particularly helpful where transit operates in a right lane with high peak hour volumes but relatively few right turns.

Primary User Groups

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Key Implementation Considerations

  • Buses must have access to a lane that allows them to reach the front of the queue at the beginning of the traffic signal cycle.
  • Bus and general traffic must have separate signals to indicate when they are able to “go.”
  • Buses may need to be equipped with transit signal priority equipment depending on the configuration

Expected Crash Reduction

A crash reduction rate has not been determined for bus queue jump lanes or signals; however, the tool allows buses to merge with traffic more easily if they are waiting at a red signal, which could reduce the chance of merge related crashes. Safety and operational benefits are recognized by transit operators.

Cost 

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Typically, medium to high cost. Significant maintenance is required for bus lane markings and additional traffic signal heads.

Timeline

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One year to three or more years, depending on complexity. Many variables can play a role in the timeline for implementation including the potential need for traffic studies, traffic signal infrastructure upgrades, and transit lane construction or realignment.

References

 

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