This synthesis highlights what leads to the success of Regional Traffic Signal Operations Programs (RTSOPs) across the United States. RSTOPs address the general mobility present in arterial street networks. Regions use RTSOPs to improve the flow of traffic from one area to another, with regard to
Purdue University conducted research on traffic signal performance measures, and collected data relating to events like changes in detector and signal phase states. This is a report done detailing the data collection and management--how it was done and where the data was collected. A few of the f
As part of Project 20-68A, Scan 07-04 was created to examine various organizational structures, institutional agreements and arrangements, and operational policies that are being used regionally throughout the United States to manage and operate traffic signal systems. This report is a summary of
This publication is a summary report describing visualization practices used as part of the congestion management process (CMP), and is a supplement to the CMP Guidebook. These visualizations include maps, charts, graphs, photographs, videos, and computer illustrations and simulations. The report
Congestion is a persistent problem on U.S. highways, stealing an average of 38 hours a year from commuters. Snarled traffic not only increases travel times but also has an adverse effect on motorists’ safety and costs to travelers and businesses. Facing this challenge with increasingly constraine
This synthesis documents the state of the practice associated with designing, implementing, and operating ATM on arterials. Of particular interest to this study has been information on strategies used to actively manage traffic and congestion on arterials; situations and operating conditions in w
This study identifies 58 roundabout corridors in the United States as of 2011. There is diversity among these corridors in terms of length, roundabout spacing, number of lanes, surrounding land use, previous control (if not a new facility), and reasons for the selection of roundabouts.
This report was developed to summarize the implementation of safety shoulders as travel lanes as a method to increase the efficient use of highway capacity. Its purpose is to provide a succinct overview of efforts to use left or right shoulder lanes as temporary or interim travel lanes. As part o
This analysis brief provides a summary of the Federal Highway Administration (FHWA) Office of Operations is sponsored research project to develop new and/or updated methodologies, data sets, and content for the Highway Capacity Manual (HCM) that will better reflect the demand and traffic flow beh
TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2396 consists of 16 pages that explore collisions in freeway traffic; self-learning adaptive ramp metering; macroscopic travel time reliability diagrams for freeway networks; the impact of heavy vehicles on fr
