In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Si… See more

The 11th edition of the MUTCD was released on December 19, 2023. The effective date, 30 days after publication, of the MUTCD was January 18, 2024. States have two years after the effective date to do one of the f… See more

Warning signs are found in the W series of the national MUTCD. They highlight existing conditions, such as a curve, school, dead end street, or traffic signal. They can also warn of possible danger such as bu… See more