Dudek, Conrad L. <br/><br/>
Changeable message signs / 
Conrad L. Dudek. 
 - Washington, D.C. :  National Academy Press,  1997. 
 - 57 p. :  ill. ;  28 cm. 
 - Synthesis of highway practice,  237  0547-5570 ; .
<br/><br/> "Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration."  "National Cooperative Highway Research Program." 
<br/><br/>Includes bibliographical references (p. 47). 
<br/><br/><label>ISBN: </label>
<br/><br/><label>LCCN: </label>91060205  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Traffic signs and signals.
<br/><br/><label>LC Class. No.: </label>TE228  / .D83 1997 
<br/><br/><label>Dewey Class. No.: </label>625.794