The proprietor of any toll bridge may require lawful toll to be paid previous to a passage thereover. But if there be demanded at any such bridge more than is lawful, the proprietor shall forfeit to the party aggrieved so much as is illegally demanded and a further sum of not less than two nor more than $15. Whoever shall knowingly or intentionally defraud, or attempt to defraud, the proprietor of any toll bridge by evading, or attempting to evade, the payment of lawful toll for crossing such bridge, or whoever shall aid another to evade, or attempt to evade, the payment of such toll, shall be guilty of a misdemeanor and, for every such offense shall, upon conviction thereof, be fined not in excess of $10.