The A35 originally ran through a narrow road tunnel under Thistle Hill, three miles north of Lyme Regis in Dorset. When the road was improved during the 1980’s, a new cutting was excavated a few yards to the south west, doing away with the need for a tunnel.
The old road alignment was abandoned although the tunnel still exists and is open at both ends with dumped soil at one end to stop cars driving through it.