Other restrictions may be in effect due to weather conditions or construction projects. Please tune to or am radio while in the Straits area. Full condition report. Check out our views of the Bridge. Maximum speed limit is 45 mph. No U-turns. No stopping on the Mackinac Bridge. In the event of a flat tire or motor failure, please remain in your vehicle.
Bridge personnel on duty will investigate and assist. Use four-way flashers while vehicle is disabled. Truck Regulations Travel in right lane β no passing. Use four-way flashers. Maximum speed is 20 mph. Rules Enforced from toll plaza to Jamet Street exit. Trucks with a gross load of over 40 tons must request escort prior to crossing. Maximum allowable vehicle weight is 72 tons. Placarded Loads Transportation of flammable liquids, liquid gases, explosives and other placarded loads requires an escort by bridge personnel.
Persons transporting these loads must call Bridge Services at for escort. Oversized Vehicles Oversized vehicles must call 24 hours in advance to arrange a bridge escort.
