Why do crashes at roundabouts tend to be less severe than those at traditional intersections (crossroads, t-intersections, signalised intersections)?
Two factors play a big role – speed and angle.
Roundabouts naturally slow vehicles as they approach and move through the intersection. The geometry requires drivers to deflect and circulate, which means speeds are typically much lower than those seen at signalised or stop controlled intersections.
Lower speed means less kinetic energy in the system before a crash even occurs.
The second factor is the angle of conflict.
At non-roundabout intersections, vehicles can collide at close to ninety degrees. These right-angle crashes transfer a large amount of energy directly into the side of the vehicle, which is one of the most dangerous impact types for occupants.
At roundabouts, vehicle paths intersect at much shallower angles. When crashes occur, they are more likely to be glancing or sideswipe type events rather than direct impacts. More of the crash energy is dissipated rather than transferred straight into the vehicle.
Lower speeds and shallower angles. It is one of the reasons roundabouts are considered a Primary Safe System treatment for passenger vehicle crashes.
———-
Follow Safe System Solutions Pty Ltd on LinkedIn for more updates and road safety industry news.