Type of Document Master's Thesis Author Kamdar, Vaibhavi Killol Author's Email Address email@example.com 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 Keywords
- Bus Efficiency
- Transit Priority
- Bus Control Delay
Date of Defense 2004-12-14 Availability unrestricted AbstractHeavy 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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