The EuroRAP Road Protection Score provides a star rating for the safety built in to the road, based on how well its design would protect car occupants from severe injury in a collision. Each road is star-rated from 1 to 4, with 4-star representing a road engineered to minimise the likelihood of severe injury.
More than 7000km of UK roads were surveyed in 2006-07 in trials jointly funded by the Highways Agency and the IAM Motoring Trust. Overall, scores for motorways are significantly higher than for Class A roads - about half of motorways and about 10% of Class A roads scored 4-star. However, 2% of motorways and 42% of Class A roads scored less than 3-star.