TY  - BOOK
T1  - Traffic signals 5 reports ; prepared for the 52nd annual meeting.
T2  - Highway research record
LA  - English
PP  - Washington, D.C.
PB  - Highway Research Board, National Research Council
YR  - 1973
UL  - https://tuklas.up.edu.ph/Record/UP-99796217610473245
OP  - 47
SN  - 0309021766
KW  - Traffic signs and signals.
KW  - Electronic traffic controls.
ER  -