1. Mandatory direction

A mandatory direction is a traffic rule or sign that tells drivers they must follow a specific direction — such as turning left, going straight, or following a designated route.

  • Usually blue circular signs with a white arrow or symbol.
  • The arrow shows the only allowed direction at that point.
  • Prevent dangerous turns or wrong-way driving.
  • Used at intersections, roundabouts, construction zones, or restricted areas.
Mandatory direction

Give way and mandatory left turn. (Debrzno, Poland) © Wikimedia.org/MOs810, CC BY-SA