If any person discharges a firearm, crossbow, slingbow, arrowgun, or bow and arrow in or across any road, or within the right-of-way thereof, or in a street of any city or town, he shall, for each offense, be guilty of a Class 4 misdemeanor. The provisions of this section shall not apply to firing ranges or shooting matches maintained, and supervised or approved, by law-enforcement officers and military personnel in performance of their lawful duties.