Traffic sign

A sign beside or above a road that communicates rules, warnings, directions, or other information to road users. Its standardized shapes, colors, and symbols help convey messages quickly.

Regulatory sign: A traffic sign that states a legal requirement, prohibition, or restriction. This sign type communicates rules road users must obey.
Traffic sign recognition: The process of detecting and identifying traffic signs from their visual features. Recognition is the first step between seeing a sign and responding to it.
Stop sign: A regulatory sign requiring drivers to stop before proceeding when safe. It assigns a clear stopping rule at intersections and other conflict points.
International Convention on Road Signs and Signals: A 1968 treaty establishing international rules and recommendations for road signs and signals. It provides a framework for harmonizing sign meanings across participating countries.
Traffic signal: An electrically operated device that assigns right of way through changing visual indications. Signals actively alternate movement permissions, while signs usually give standing instructions.
Warning sign: A traffic sign that alerts road users to hazards or unusual conditions ahead. Its message prepares drivers for danger before they reach it.
Road sign placement: The positioning of signs relative to roads, intersections, hazards, and drivers. Placement controls when a message becomes visible and how much response time it allows.
Speed limit sign: A regulatory sign stating the maximum lawful speed for a road or area. It communicates a numerical speed restriction to approaching drivers.
Vienna Convention on Road Signs and Signals: The 1968 international treaty commonly named for standardizing road signs and signals. Its provisions shaped a widely used international approach to sign design.
Road marking: A line, symbol, or text applied to a road surface to guide or regulate traffic. Markings communicate through the roadway surface rather than roadside or overhead panels.

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