Fenders shall be securely attached to the vehicle and inspected for: Tears; Sharp or jagged edges; Sufficient coverage of the wheel and tire, both from the body outward and to the front and rear of tires and wheels. Buses or commercial motor vehicles, including semitrailers and trailers, shall be equipped with suitable metal protectors or substantial flexible flaps behind the rear-most wheels of the vehicle or combination to prevent the projection of rocks, dirt, water, or other substances to the rear and to minimize side spray. This regulation may not apply to: Any farm tractor; Any vehicle registered as a farm truck; Uncoupled truck tractors; Pole trailers; or Other vehicles where the construction is such that complete freedom around the wheel area is necessary to secure the designed use of the vehicle (see Regulation .22, diagrams 9—11). Do not certify if: The fender has tears, sharp or jagged edges; The fender is not securely fastened to the body; The fender does not extend outward from the body to cover the top of the wheel and tire; The rear of all fenders does not extend downward to the horizontal centerline of the wheel (extreme bottom edge of fender or rear quarter panel); The front of all fenders does not extend forward to at least within a 45-degree angle of the horizontal centerline; Fenders have been extended downward to compensate for suspension modifications; A motorcycle rear fender is improperly mounted or missing (front fender is not required); A commercial vehicle or trailer is not equipped with flaps as required. Fenders may be extended outward to compensate for tire or wheel changes provided the extension: Provides required coverage of wheels and tires; Is constructed of substantial materials; Is securely attached to the fenders; Has all edges rolled to eliminate sharp or jagged edges.