156 articles
Vienna Convention on Road Signs and Signals
The Vienna Convention on Road Signs and Signals is a 1968 United Nations treaty standardizing road signs, traffic lights, and markings, in force since 1978.
Vienna Convention on Road Traffic
The Vienna Convention on Road Traffic is a United Nations treaty done at Vienna on 8 November 1968 that harmonizes rules of the road and driving permits.
Weigh-in-motion
Weigh-in-motion (WIM) is a transportation engineering method that estimates a road vehicle's axle loads and gross weight from sensors it drives over, without stopping, for enforcement screening and pavement design.
Wide moving jam
A wide moving jam is a dense, slow region of freeway traffic that propagates upstream, keeping its downstream front velocity nearly constant; central to Kerner's three-phase traffic theory.
Wiedemann model
The Wiedemann model is a psycho-physical car-following model in which drivers react to the vehicle ahead by crossing perception thresholds, introduced by Rainer Wiedemann in 1974.
Yield sign
The yield sign, also known as the give way sign, is an inverted red-and-white triangle directing drivers to slow and let others with the right-of-way go first.