There is a small detour at the intersection of Indiana Highway 18 and 3 west of the Montpelier Motor Speedway. There is a short 2 mile detour around the bridge here http://www.montpeliermotorspeedway.c...from-the-west/

Jim's route above will also work but will take you through downtown Hartford City and several stop lights. The road you turn on at the jail will run right past the east of the speedway property once you get into the Montpelier city limits.