Title page for ETD etd-01072005-120035

Type of Document Master's Thesis
Author Kamdar, Vaibhavi Killol
Author's Email Address vkkamdar@vt.edu
URN etd-01072005-120035
Title Evaluating the Transit Signal Priority Impacts along the U.S. 1 Corridor in Northern Verginia
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Collura, John Committee Chair
Teordorovic, Dusan Committee Member
Tignor, Samuel C. Committee Member
  • Bus Efficiency
  • Transit Priority
  • Bus Control Delay
  • UTDF
  • NEMA
Date of Defense 2004-12-14
Availability unrestricted
Heavy traffic volumes in peak hours accompanied by closely located signalized intersections and nearside bus stops on U.S. 1, result in congestion and traffic delays that bus transit may be able to alleviate to some extent. The capital investment and operating costs of other transit solutions such as “Bus Rapid Transit” and “Heavy Rail Transit” projects were found to be cost prohibitive compared to bus transit signal priority (TSP) options. Successful implementation of a limited TSP pilot project led local authorities to conclude that TSP should be extended to the full length of the Fairfax Connector bus routes on U.S. 1.

This research focused on testing the impacts of a ten second green extension priority strategy for all the northbound transit buses in the morning peak period at twenty-six signalized intersections along U.S. 1. A micro simulation model VISSIM 3.7 was used to analyze the impacts of TSP.

The simulation analysis indicates that the Fairfax Connector buses might benefit from the

green extension strategy. Overall, improvements of up to 4% for transit travel time savings and 5-13% reduction in control delay for transit vehicles were observed. Considering all side street traffic, the total increase in maximum queue length might be up to 1.23%.

Future research possibilities proposed include the evaluation of different priority strategies such as an early green, red truncation and queue jumps. Impacts of using a dedicated lane for transit buses along with TSP can also be evaluated. Conditional transit signal priority may also include bus occupancy levels and bus latenesses.

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