Highways Agency Reports

In a comprehensive review of roundabouts, it could be beneficial to look at their origins. The conventions or rules of use, are as important as the layout. The history of roundabouts shows that those conventions must be conveyed by clear signs and warnings, and by the indications implicit in the layout. If this is done well, then drivers will respond logically, including moderating their speed, and readily learn to exploit the junction, often exceeding previous expaectance of capacity. The layout will also be safe if the arrangement induces the necessary decisions and manoeuves to be made at a speed within the average human capacity.