TY  - BOOK
ED  - National Research Council (U.S.).
ED  - American Association of State Highway and Transportation Officials.
ED  - United States.
TI  - Changeable message signs
SN  - 0309029163 :
AV  - TE228 .N3 1979
U1  - 625.795 
PY  - 1979///
CY  - Washington
PB  - Transportation Research Board, National Research Council
KW  - Traffic signs and signals
KW  - Variable message signs
N1  - "Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration."; Includes bibliographical references
ER  -