A bicycle path crossing is either of the following:
(1)
That portion of a roadway included within the prolongation or connection of the boundary lines of a bike path at intersections where the intersecting roadways meet at approximately right angles.
(2)
Any portion of a roadway distinctly indicated for bicycle crossing by lines or other markings on the surface.
(b)
Notwithstanding subdivision (a), there shall not be a bicycle path crossing where local authorities have placed signs indicating no crossing.