LANSING, MI - Starting Monday, weight restrictions are in effect on all state highways.  Officials with the Michigan Department of Transportation says that applies for all state routes with M, I, or US designations from the Indiana and Ohio borders north to the Mackinac Bridge.  Extended permits will be valid for oversize loads in the weight-restricted area on those routes.  More information is available on MDOT's trucker website at michigan.gov/truckers.