HC Deb 13 November 1972 vol 846 c34W
Mr. Alan Williams

asked the Secretary of State for the Environment what he considers to be the relationship between traffic flows and the optimum size of roundabouts; and to what extent experience of mini-roundabouts allows conclusions to be drawn about their relative safety.

Mr. Peyton

The capacity of a roundabout is increased by increasing the area available for circulation. Mini-roundabouts reduce the outside circumference required for a given capacity. The first accident returns give grounds for hope that they may prove to be safe than alternative designs.