Changeable message signs. 

 - Washington :  Transportation Research Board, National Research Council,  1979. 
 - 37 p. :  ill. ;  28 cm. 
 - Synthesis of highway practice ;  61  0547-5570 .
<br/><br/> "Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration." 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0309029163 :  $5.60 
<br/><br/><label>LCCN: </label>79066677  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Traffic signs and signals.<br/>Variable message signs.
<br/><br/><label>LC Class. No.: </label>TE228  / .N3 1979 
<br/><br/><label>Dewey Class. No.: </label>625.795