01590978

Component

https://doi.org/10.3141/2585-02

Roundabouts have been used widely on all road classes in the United Kingdom because they are considered safer than other types of intersections in general. The objective of this study was to examine geometric and traffic characteristics and their influences on the number of accidents. Data from each of 70 roundabouts (with 284 approaches) included all recorded vehicle accidents as well as geometric and traffic characteristics for the entire roundabout, within circulatory lanes, and at roundabout approaches. Resulting estimates were compared with those from random-parameter and fixed-parameter negative binomial count data models. The random-parameter results provided better goodness of fit than the fixed-parameter results, and more variables were found to be significant. Significant variables that influenced the number of accidents were total approach traffic, truck percentage, entry width, inscribed circle diameter, number of lanes, and presence of traffic signals.

01589843

16-3545

English

pp 11–19

2016

Transportation Research Record: Journal of the Transportation Research Board

9780309370035

Print

Figures (5) ; References (39) ; Tables (4)

Binomial distributions; Crash risk forecasting; Geometric design; Mathematical prediction; Roundabouts; Traffic characteristics; Traffic crashes

United Kingdom

Design; Highways; Operations and Traffic Management; Safety and Human Factors

TRIS, TRB, ATRI

Jan 12 2016 5:33PM

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