TY  - BOOK
ED  - National Research Council (U.S.).
TI  - Maintenance management of traffic signal equipment and systems
SN  - 0309022053
AV  - TE228 .N3 1974a
U1  - 625.794 
PY  - 1974///
CY  - [Washington]
KW  - Traffic signs and signals
KW  - Maintenance and repair
N1  - Bibliography: p. 38-39
ER  -