Safety features of stop signs at rail-highway grade crossings /
| Autores principales: | , , |
|---|---|
| Formato: | Libro |
| Lenguaje: | English |
| Publicado: |
Springfield Va. :
National Technical Information Service,
1979.
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| Materias: |
Tabla de Contenidos:
- Contenido: v. 1. Executive summary
- v. 2. Technical report.