Reduced speed limit ahead sign: what it means

What does the reduced speed limit ahead sign mean?

MUTCD Section 2C.40 says the sign should be used where the speed limit is being reduced by more than 10 mph, or where engineering judgment says road users need advance notice. It must be followed by a Speed Limit sign at the start of the zone, showing the same speed.

Quick quiz

Where will you see it?

On the approach to towns, school areas and other lower speed zones.

What should you do?

Slow down in good time so you are at or below the new limit when you pass the speed limit sign.

What do people get wrong?

Waiting for the speed limit sign before you start to slow down.

Common questions

Where does the new limit start?

At the Speed Limit sign that follows this one (Section 2C.40).

Is the number on it the new limit?

Yes. Section 2C.40 says it must match the next Speed Limit sign.

Compare with

• Speed limit signThe maximum speed allowed on this road.
• School speed limit signA lower speed limit near a school when the lights flash.

Want to test someone else? Play a road-sign quiz with friends and family.

Sources

Checked on 4 November 2026 against the MUTCD 11th Edition (FHWA), Section 2C.40.

1. MUTCD 11th Edition, Chapter 2C, Warning Signs and Object Markers: Section 2C.40, FHWA
2. MUTCD 11th Edition, FHWA. FHWA lists the current version as the 11th Edition with Revision 1, dated December 2025

Sign pictures are our own simplified drawings of the MUTCD designs, which are in the public domain (MUTCD Section 1D.06). Sources and image credits.