Whenever a pedestrian is crossing or attempting to cross a public street or highway, guided by a guide dog or carrying in a raised or extended position a cane or walking stick which is white in color or white tipped with red, the driver of every vehicle approaching the intersection or place where such pedestrian is attempting to cross shall bring his vehicle to a full stop before arriving at such intersection or place of crossing and before proceeding shall take such precautions as may be necessary to avoid injuring such pedestrian.