The guidance supplied in this document, Roundabouts: An Informational Guide, is based on
established international and US practices and is supplemented by recent research. The …

TRB's National Cooperative Highway Research Program (NCHRP) Report 672:
Roundabouts: An Informational Guide-Second Edition explores the planning, design …

This synthesis presents information on current practices with respect to the planning, design,
and operation of modern roundabouts in the United States. It will be of interest to state and …

This report reviews current research and practice on modern roundabouts, both in the US
and other countries. The report compares the advantages and disadvantages of …

Control of traffic at a road junction by roundabout or gyratory movement, creates problems in
design that are unique. The history of research on roundabouts, shows that" what is going …

Over recent decades roundabouts have become increasingly used when building new at-
grade intersections or up-grading junctions all over the world, and when rebuilding existing …

Roundabouts have become popular in Australia and many countries in Europe during the
past few decades. In the United States of America, however, roundabouts are just beginning …

A meta-analysis of studies reported outside the United States was performed to evaluate the
effects on road safety of converting intersections to roundabouts. Twenty-eight studies that …

Modern roundabouts have become a common element in urban und rural traffic networks.
The design standards as they have been developed over the times since 1985 have proven …

The findings of a 3-year study conducted at Pennsylvania State University for FHWA on the
safety and operational performance and geometric characteristics of roundabouts are …