Arrival Turning Flows
Average Daily Traffic
Fast Path Radius R1
Approach Curvature R0
The approach curvature is 1/ R0 the approach radius. This is measured over a distance of 1600 ft (500 m) prior to the yield line.
Approaching the roundabout, a left hand radius is positive, reducing accidents while a right hand radius is negative increasing accidents.
The radius is a given and cannot be changed.
Input is the + 1/R0 so a straight approach is zero rather than infinite radius.
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