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This 2010 TRB report on planning, design, construction, maintenance, and operation of roundabouts remains useful in helping to explain the trade-offs associated with roundabouts.
The TRB National Cooperative Highway Research Program's NCHRP Report 672: Roundabouts: An Informational Guide – Second Edition 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.
Equation 6-3 on page 6-58 incorrectly contains an addition sign (+) as an operator. The correct operator should be a subtraction sign (-).
Exhibit 5-23 on page 5-29 of NCHRP Report 672 contains an incorrect calculation of estimated injury crashes.
There is a summary document, Paths to Practice, available.
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