School Speed Limit Sign
MUTCD S5-1
Obey the reduced speed limit during the posted school hours.
What it looks like
A white vertical rectangular regulatory sign with a black SCHOOL SPEED LIMIT legend and the reduced speed number.
When you'll see it
In school zones where a lower speed limit applies during posted school hours or when children are present.
What to do
You must obey the reduced speed limit during the posted school hours; slow to the shown speed and watch for children.
Related signs
Source: Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition — FHWA.