Motorists? requirements for active grade crossing warning devices / 
United States, Department of Transportation 
 - Washington, D. C. :  The Department,  1979 
 - xii, 253 p. :  ill. ;  28 cm. 
<br/><br/>Bibliography : p. 256-257-258 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Highway engineering--United States
<br/><br/><label>Dewey Class. No.: </label>625.70973