DESIGN AND IMPLEMENTATION OF TRANSIT PRIORITY AT SIGNALIZED INTERSECTIONS: A PRIMER OF TRANSIT MANAGERS AND A REVIEW OF NORTH AMERICAN EXPERIENCE
Bibliographic record
Abstract
The efficiency of bus transit operations in urban areas is directly affected by traffic congestion and delay at signalized intersections. In addition, reduced speeds and variability of schedule adherence reduces the attractiveness of the service for transit customers. Priority for transit buses at signalized intersections is one strategy to alleviate the negative impacts of congestion and delay. However, there has not been extensive experience in North America with transit priority at signalized intersections. This report was prepared to assist transit managers and other professionals to plan, design and implement transit priority measures successfully. The report provides a Primer for Transit Managers that includes an overview of transit priority concepts, followed by a primer on pertinent traffic engineering considerations. Using a comprehensive literature review as a basis, the Overview of Transit Policy addresses: bus lanes, queue bypass lanes, by priority access to freeways, traffic signal priority, operational priority, regulatory transit priority measures, and comprehensive transit priority plans. The Primer on Traffic Engineering Considerations includes: traffic safety, traffic flow characteristics, traffic signal timing, traffic control equipment, and transit signal priority. The report then presents a number of case studies of transit signal priority including: Toronto, Ottawa, Suburban Chicago, Bremerton (Kitsap Transit), WA and Tacoma (Pierce Transit), WA. The case studies illustrate different approaches. The report finally provides a number of conclusions drawn from the case studies, as well as planning and implementation guidelines for transit signal priority. All five case studies report improved operations for buses and no significant traffic problems as a result of transit priority. Traffic signal priority is a measure that can improve transit services and efficiency. However, it is also noted that clear policy direction from elected bodies and a close working relationship between transit and traffic staff are important elements of successful projects.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.013 | 0.010 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.004 | 0.007 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.006 | 0.007 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.004 | 0.004 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".