The Cronk Urleigh section of the A3 Castletown to Ramsey road was part of the 37.50 Mile
Four Inch Course used for the RAC Tourist Trophy automobile races held in the Isle of Man between 1908 and 1922. In
1911, the Four Inch Course for automobiles was first used by the Auto-Cycling Union for the
Isle of Man TT motor-cycle races. This included Cronk Urleigh, the 13th Milestone and the Westwood Corner ( Ballalona Bridge) section and the course later became known as the 37.73 mile (60.70 km)
Isle of Man TT Mountain Course which has been used since 1911 for the
Isle of Man TT Races and from 1923 for the
Manx Grand Prix races. During the
1970 Lightweight TT Race, the Spanish professional motor-cycle racer
Santiago Herrero crashed at Westwood corner section of the TT Course and later dying from his injuries. ==References==