Did you know, modern roundabouts are the safest at-grade intersection?
They move traffic safely and efficiently through an intersection due to slower speeds, fewer conflict points (see diagram below), and easy decision-making.
Increased capacity - reduced delay:
There is a 30-50% increase in traffic capacity, and since traffic is always on the move, there is less delay.
Fewer idling cars reduces pollution and fuel usage - and because there are fewer starts and stops, intersections are far less noisy.
Lower Maintenance Costs:
Because roundabouts do not require traffic signals, there is no equipment to be installed or repaired. This equates to an average saving of $5,000 per year. Also, the average service life of a roundabout is 25 years versus 10-20 years for a signalized intersection.
Roundabouts improve the visual quality and character of an intersection through landscaping.
In 2004, the Institute of Transportation Engineers estimated that if only 10% of the estimated 265,000 intersections with signals in the United States were converted to roundabouts, annual vehicle delays would decrease by eight million hours and fuel consumption would be reduced by more than five million gallons.