History of Secondary Highway 667:
Secondary Highway 667 is a minor collector highway that serves as an access road from Highway 129 to the small community of Sultan, located southeast of Chapleau. The Sultan Road was first designated as Highway 667 in the late 1970s. In March 1977, a Preliminary Assumption Plan was prepared by the Ministry of Transportation and Communications (MTC) which showed the planned assumption of the Sultan Road as a new Secondary Highway. The Preliminary Assumption Plan was registered on April 1, 1977, and the route was formally designated as Secondary Highway 667 by an Order-in-Council dated May 23, 1977. The highway was only gravel-surfaced at first, but the entire route was paved in 1980. Motorists who use Highway 667 can access the Sultan Industrial Road, a privately-owned forestry road which leads to Highway 144. The Sultan Industrial Road is open to public travel and forms the shortest route between Sudbury and Chapleau. Unless posted otherwise, the speed limit on Highway 667 is 80 km/h (50 mph). There are no services available on this highway.