Signal-controlled roundabouts

The total number of accidents at signal-controlled roundabouts is similar to that before the signals were installed (on average 5.85 injury accidents per year at each of the roundabout sites before signalisation and 5.79 after the signals had been installed). 

For pedestrian crossings at the exits from signal-controlled roundabouts, a right/ left stagger is acceptable. 

Roundabouts with ICDs greater than 50 m should have off-road routes for cyclists with signal-controlled crossings on entry and exit alternatively a grade-separated route should be provided. 

Roundabouts are sometimes converted to signal control to improve... 

Roundabouts are sometimes converted to signal control to improve safety, but more commonly for capacity reasons. There is evidence of improvement in safety, particularly for two-wheeled vehicles. 

If 10 percent of American intersections with traffic signals were converted to roundabouts (rotaries), which improve traffic flow and control speed, more than 70,000 collisions would be prevented annually, including 450 fatalities. 

On the roads, authorities use signs and signals to control access to intersections, thereby minimising conflict, and use roundabouts to both reduce speed on the approach to an intersection and make the collision angles relatively shallow should a crash occur. 

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