System-wide safety improvements : an approach to safety consistency /
        Wedi'i Gadw mewn:
      
    
                  | Prif Awdur: | |
|---|---|
| Awduron Corfforaethol: | , , | 
| Awduron Eraill: | |
| Fformat: | Llyfr | 
| Iaith: | English | 
| Cyhoeddwyd: | Washington, D.C. :
        
      Transportation Research Board, National Research Council,    
    
      [1987]. | 
| Cyfres: | Synthesis of highway practice ;
              132. | 
| Pynciau: | 
| Disgrifiad o'r Eitem: | "Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration." "September 1987." | 
|---|---|
| Disgrifiad Corfforoll: | 20 p. : ill. ; 28 cm. | 
| Llyfryddiaeth: | Includes bibliographies. | 
| ISBN: | 030904409X | 
| ISSN: | 0547-5570 ; |