A roundabout is a one-way circular intersection without traffic signal equipment in which traffic flows around a center island.
Unlike traffic circles from years ago, a modern roundabout provides safe and efficient traffic flow. It operates with yield control at the entry points and gives priority to vehicles within the roundabout.
WHY BUILD A ROUNDABOUT INSTEAD OF A TRAFFIC SIGNAL?
Roundabout move traffic safely and efficiently through an intersection because of:
- Slower speeds
- Fewer conflict points
- Easy decision-making
Studies show that roundabouts provide:
- 90% reduction in fatal crashes
- 75% reduction in injury crashes
- 30 to 40% reduction in pedestrian crashes
- 10% reduction in bicycle crashes
Slower vehicle speeds mean:
- Drivers have more time to judge and react
- Easier to use for older and beginner drivers
- Reduction in the severity of accidents
- Pedestrians are safer
Efficient traffic flow:
- Traffic always on the move- less delay
- 30 to 50% increase in traffic capacity
- Reduction in pollution and fuel use
- Less noise due to fewer stops and starts
- No signal equipment to install and repair
- Provides traffic calming
DIAGRAM OF A TYPICAL ROUNDABOUT
Compared to standard instersections, there are fewer conflict points in a roundabout
(Above) A traditional intersection has 32 conflict points. (Below) Modern roundabout have 16 conflict points. Accident in roundabout are typically minor due to slower speeds and indirect contact points.