This compares with 45% of accidents on single carriageways, 9% on dual carriageways and 1% on one-way streets.
Other accidents took place outside drivers’ homes (5%) and other premises, such as car parks (20%), according to results released by insurance claims management firm WNS Assistance.
A spokesman said: ‘WNS compared all its motor accident figures over the last three years for the survey. The figures revealed a remarkable consistency over the period, with only single-carriageway accidents rising significantly last year by 5% over 2003. Dual-carriageways accounted for a small rise of 2% in 2004 over the previous two years.’