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Complete Regional Transportation Plan 2012 - Cape Cod ...

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afforded by roundabouts. For example, safety problems that could be improved by aroundabout include:High rates of crashes such as right angle, head-on, left/through, U-turns, etc.High crash severity that could be reduced by slower speedsSite visibility problems that reduce the effectiveness of stop sign controlInadequate separation of movements, especially on single-lane approachesThe following figure shows that roundabouts have fewer annual injury crashes than ruraltwo-way stop-controlled (TWSC) intersections, and the total number of crashes atroundabouts is relatively insensitive to minor street demand volumes.FIGURE 3 - COMPARISON OF PREDICTED ROUNDABOUT INJURY CRASHES WITH RURAL 2-WAYSTOP -CONTROLLED INTERSECTIONS.(Source: FHWA)The Roundabout guide also includes information to compare roundabouts to signalizedintersections. The following figure shows that roundabouts have fewer injury accidentsper year than signalized intersections, particularly in rural areas. At volumes greaterthan 50,000 vehicles per day (shown on the figure as “ADT” – average daily traffic),urban roundabout safety may be comparable to that of urban signalized intersections.<strong>Cape</strong> <strong>Cod</strong> <strong>Regional</strong> <strong>Transportation</strong> <strong>Plan</strong> | August 2011Chapter 3: SafetyPage 287

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