"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))