(1) A truck wheel must not have more than twenty-five percent of the lugs missing or defective.

(2) All truck wheels must be maintained free of cracks, breaks, or defects.

(3) Windshields on all equipment must have windshield wipers in good working condition.

(4) Mule train trailers must have a platform on the trailer tongue at least twelve inches by twenty-four inches made of nonslip material and able to support at least three hundred pounds. The platform must be self-cleaning.

(5) Trailer loading and unloading straps, links, or chains must be fastened securely to the trailer frame and used in hoisting the trailer. The connections must be maintained in good condition and not be attached to the trailer bunk. Using molles for this purpose is prohibited.

(6) When unloading trailers from trucks, the trailers must be hoisted clear, the truck driven forward a safe distance, and the trailer lowered to within one foot of the roadway before persons approach the trailer or reach.

(7) Trailer hoisting or unloading straps must be constructed and installed in a manner enabling the loading or unloading machine to engage the strap without manual personal contact.

(8) All motor vehicles must be equipped with a horn that is audible above the surrounding noise level. The horn must be sounded before operating the vehicle in reverse gear and when necessary to alert employees.