(a) No toll shall be imposed on the passage of a pedestrian or bicycle over any bridge that is part of the state highway system, on which the travel of pedestrians and bicycles is otherwise authorized, and on which tolls are imposed on the passage of motor vehicles, including any bridge constructed pursuant to a franchise granted under this article.
(b) This section shall remain in effect only until January 1, 2021, and as of that date is repealed, unless a later enacted statute, that is enacted before January 1, 2021, deletes or extends that date.