(a) Where sidewalks are provided it shall be unlawful for any pedestrian to walk along and upon an adjacent roadway.
(b) Where sidewalks are not provided any pedestrian walking along and upon a highway shall when practicable walk only on the left side of the roadway or its shoulder facing traffic which may approach from the opposite direction.
(c) No person shall stand in a roadway for the purpose of soliciting a ride from the driver of any vehicle.