Nothing contained in § 46.2-933 shall be construed to deprive any totally or partially blind or otherwise incapacitated person not carrying such a cane or walking stick or not being guided by a dog, of the rights and privileges conferred by law upon pedestrians crossing highways. Nor shall the failure of such totally or partially blind or otherwise incapacitated person to carry a cane or walking stick, or to be guided by a guide dog on the highways or sidewalks of the Commonwealth, be held to constitute nor be evidence of contributory negligence.