TCRP A-39: Transit Priority Treatments

KAI is the prime consultant for TCRP A-39, evaluating strategies to increase transportation efficiency through the implementation of transit-supportive treatments. Transit-supportive strategies include both intersection treatments (such as transit signal priority, special signal phasing, queue jump lanes and signals, bypass lanes and curb extensions) and roadway segment treatments (such as exclusive or shared transit lanes within the travelled way, exclusive transitways [typically in the median], and corridor signal progressions favoring transit operations).

The partnering of transit and highway/traffic agencies throughout the project development process was necessary but not sufficient; a clear understanding of the criteria for and costs and impacts of such strategies are critical to the implementation of transit-supportive strategies.

The objectives of this research were to:

(1) identify consistent and uniform strategies to improve transportation network efficiency to reduce delay and improve reliability for transit operations on roadways;
(2) develop decision-making guidance for operational planning and functional design of transit/traffic operations on roads that provides information on warrants, costs, and impacts of strategies;
(3) identify the components of model institutional structures and/or intergovernmental agreements for successful implementation; and
(4) identify potential changes to the Manual on Uniform Traffic Control Devices (MUTCD) and related documents to facilitate implementation of selected strategies.

This research built on the information presented in TCRP Synthesis 83: Bus and Rail Transit Preferential Treatments in Mixed Traffic.