This report provides comprehensive and uniform guidelines for safe and efficient yellow change and all-red clearance intervals at signalized intersections. The project (1) reviewed and compared the definitions of yellow change and all-red clearance intervals,(2) conducted a critical review o
The purpose of this project was to estimate the impact of weather on U.S. roadway freight operations. It was already known that the freight sector of transportation could be greater than $600 billion of total gross domestic product, and 70 percent of that total value is moved by truck. Therefore,
The report assesses the feasibility of employing predictive algorithms driven by historical and real-time traffic data to provide pre-trip, time-dependent travel time information based on origin, destination, and departure time. MyRoadTripAdvisor.com is working prototype of a forecasting ser
This research project included work in several areas related to the operation of traffic signal systems in oversaturated traffic conditions. Some of the strategies and methods addressed in the guide include metering, gating, turn restrictions, dynamic lane control or assignment, offset weighting,
There has been a strong interest in what has become known as maintenance quality assurance, or MQA, over the past decade. This interest is driven by both the growing recognition of the importance of highway maintenance in preserving a valuabl
In many urban areas, traffic congestion commonly delays bus services and adversely affects schedule reliability. Bus priorities on streets and highways have been successfully used for almost a half century. More recently, some communities have adopted policies and
Institutional Architectures to Support Operational Strategies combines both research and guidance relating to the institutional preconditions within state DOTs for effective management of non-recurring congestion. The objective of the project is to identify the preconditions to “institutionalizin
This report explores the use of social media among transit agencies and documents successful practices in the U.S. and Canada. Thirty-four of 39 transit agencies in large metro, small urban, and rural areas responded to a survey, and six of those participated in phone interviews to develop case e
