I. Where sidewalks are provided it shall be unlawful for any pedestrian to walk along and upon an adjacent roadway.
II. Where a sidewalk is not available, any pedestrian walking along and upon a way shall walk only on a shoulder, as far as practicable from the edge of the roadway. Where neither a sidewalk nor a shoulder is available, any pedestrian walking along and upon a way shall walk as near as practicable to an outside edge of the roadway, and if on a two-way roadway, shall walk only on the left side of the roadway.
III. Except as otherwise provided in this chapter, any pedestrian upon a roadway shall yield the right of way to all vehicles upon the roadway.