Wikipedia:April Fools/April Fools' Day 2023/Manual on Uniform Traffic Control Devices

  Red: Regulatory

  Black: Regulatory

  White: Regulatory

  Yellow: Warning

  Yellow-green: Warning (School zones, playgrounds, bicycles, and pedestrians)

  Orange: Construction

  Green: Guide

  Blue: Services

  Brown: Recreational services

  Purple: Electronic tolling

  Pink: Incident management