Changeable message signs

Changeable message signs

Xehetasun bibliografikoak
Egile korporatiboa: National Research Council (U.S.). Transportation Research Board, American Association of State Highway and Transportation Officials, United States. Federal Highway Administration
Formatua: Liburua
Hizkuntza:English
Argitaratua: Washington, D.C. Transportation Research Board, National Research Council 1979.
Gaiak:
Traffic signs and signals.