Roundabouts are increasingly recognized as an intersection control strategy that can fulfill multiple performance goals related to traffic operation and safety, and meet societal goals related to sustainability, livability, complete streets, context sensitive design, economic development, and others. Some transportation agencies have recently constructed or approved the use of a series of roundabouts on an arterial rather than the traditional solution of coordinated signalized intersections. While there are anecdotal reports suggesting that functionally interdependent roundabouts on a corridor are successful in meeting performance goals, little research has been conducted to determine objectively the efficacy of this alternative as compared to signalized intersections. The performance of traffic signal systems on arterials is well researched and documented, and methods to predict their performance are well established. Performance measures for isolated roundabouts exist and safety research has consistently shown that signalized intersections have higher injury crash rates when compared to roundabouts. In contrast, qualitative and quantitative information on the performance of a set of functionally interdependent roundabouts on arterials is lacking.
Evaluating the Performance of Corridors with Roundabouts. National Cooperative Highway Research Program (NCHRP) Report 772
2014
253 pages
Report
No indication
English
Road Transportation , Transportation Safety , Transportation & Traffic Planning , Transportation , Roundabouts , Design , Operations , Border crossings , Delay time , Highway transportation , Trucks , Industries , Transportation management , Performance evaluation , Research program , Cargo transportation , Travel time , Highway corridors , Speed , Transportation safety , Reliability