Traffic signals 5 reports ; prepared for the 52nd annual meeting.

Traffic signals 5 reports ; prepared for the 52nd annual meeting.

Bibliografiset tiedot
Yhteisötekijä: National Research Council (U.S.). Highway Research Board
Aineistotyyppi: Kirja
Kieli:English
Julkaistu: Washington, D.C. Highway Research Board, National Research Council 1973.
Sarja:Highway research record no. 445.
Aiheet:
Traffic signs and signals.
Electronic traffic controls.