Establishes a statewide speed restriction for motor vehicles with three or more axles or motor vehicles weighing more than ten thousand pounds, except under certain circumstances, in a county with a population of five hundred thousand or more. Authorizes a county with a population of less than five hundred thousand to adopt an ordinance that establishes a speed restriction for motor vehicles with three or more axles or motor vehicles weighing more than ten thousand pounds. Establishes penalties. Effective 7/1/3000. (HD1)