Optimal size of roundabout for safety considerations

Recently, Indian roundabouts caused hundreds of fatal accidents due to their poor geometrical designs and unconventional driving behaviour. This study addresses safety concerns in roundabouts by analyzing different roundabout in India with varying sizes and traffic conditions. Study also identifies 240 roundabouts in India and 13 roundabouts of varied traffic conditions and vehicular composition are selected.We have investigated all conflict points of variable severities and locations on a roundabout. Research put forward solutions to reduce vehicular conflicts through optimization of sizes. This approach benefitted in reducing 32 conflicts points to 8 on roundabouts in such a way that all fatal conflicts are eliminated.