Traffic statistics consistently demonstrate that roundabouts  are safer than typical four-way intersections.   Collisions can be reduced by 50 to 90 percent when a typical  intersection is converted to a roundabout.  Here’s why:

Vehicles move slowly in one direction so they normally don’t crash head-on or at right angles which can occur at intersections with stop signs or traffic lights.  When crashes do occur in a roundabout, they are generally slow-speed side-swipes with fewer, less serious injuries.

“Conflict points,” where a crash could occur, decrease from 32 at a four-way intersection to eight at a roundabout.


The number of potential vehicle/pedestrian conflict points (if pedestrians are allowed) decreases from 24 at a four-way intersection to eight at a roundabout.


Roundabouts are usually safer for pedestrians than typical intersections because pedestrians walk across the roundabout approaches (not across the center island), crossing one direction of traffic at  a time.  Compared to typical  intersections, the crossing distance is fairly short, pedestrians can pause at  the splitter island, and vehicle speeds are slower.  However, not all roundabouts allow pedestrians.

collision 4 way


Typical  collision at four-way stop






Reduction  of conflict points with roundabouts


conflict-points 2


32 conflict points at four-way intersections