Safety features of stop signs at rail-highway grade crossings - Sanders, James H.; McGee, W.; Yoo, Chang S. (Springfield Va. : National Technical Information Service, 1979)
Contenido: v. 1. Executive summary--v. 2. Technical report.
Fotocopia de: Sprinfield, Va. : National Technical Information Service, 1978.
Keywords: REGLAMENTOS DEL TRANSITO; SEÑALES DE TRANSITO