"Crosswalk" means:
(a) That part of a roadway at intersections ordinarily included within the real or projected prolongation of property lines and curb lines or, in the absence of curbs, the edges of the traversable roadway;
(b) Any portion of a roadway at an intersection or elsewhere, distinctly indicated for pedestrian crossing by lines or other markings on the surface;
(c) Notwithstanding subsections (a) and (b) hereof, there shall not be a crosswalk where authorized signs have been placed indicating no crossing. (ORC 4511.01(LL))