Traffic Signs Manual

Código da estrada

Portugal.

Transportation infrastructure

United States. General Accounting Office

Truck

Donald Crews

Physical fitness

Bud Getchell

Wilkinson's road traffic offences

G. S. Wilkinson

Red light, green light

Margaret Wise Brown

The human factors of transport signs

Tim Horberry

D.C. Investigation

United States. Congress. House. Committee on the District of Columbia

Time-based coordination of traffic signals

Owen Curtis