Billown Circuit Billown Circuit The Billown Circuit is a motorcycle road-race course used for the Southern 100, the Pre-TT Classic races and the National Road Races meetings near Castletown on the Isle of Man. Racing is held on public roads closed for racing by an Act of Tynwald, the parliament of the Isle of Man. The course is 4.25 miles (6.8 km) long and is in the parishes of Arbory and Malew. The course start-line is on the outskirts of Castletown and the course includes parts of the primary A5 New Castletown Road, A28 Castletown to Ballabeg Road, A7 Ballasalla to Port
Port Erin carriages. Prior to this the rolling stock was stored in the open. Bus services operate directly through a depot in Bridson Street in the village to the island's capital Douglas via Port St Mary, Colby, Castletown and Ballasalla using route numbers 1, 2, 11 and 12; these run about every twenty minutes at weekdays and Saturdays, with a less frequent service at weekends and after 6.00pm. Some of these services (1c and 11b) use an alternative coastal route. The route is the island's busiest, partly because it calls at the island's airport. A late evening service also operates on Friday