TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.

Reviews & documents European procedures & practices in roadway geometric design & context sensitive design, in which a balance is sought between safety & mobility needs & community interests. In European countries, the general philosophy for highway design & project development is to develop a transport. program & system that enhances community values & integrates roadways into communities & the environment, with very high safety goals. There are potentially transferable practices to the U.S. re: public involvement in project planning: self-explaining, self-enforcing rural roads; design flexibility; area-wide traffic calming measures; intersection control through roundabouts; & integration of bicyclists & pedestrians. Illustrated.

Explore the Art and Science of Geometric DesignThe Geometric Design of Roads Handbook covers the design of the visible elements of the road-its horizontal and vertical alignments, the cross-section, intersections, and interchanges. Good practice allows the smooth and safe flow of traffic as well as easy maintenance. Geometric design is covered in d

A properly designed roadway takes into consideration mobility and safety while addressing natural and human environmental aspects.