What it means
The school zone sign is a yellow-green pentagonal (five-sided) warning sign that marks the beginning of a reduced-speed zone around a school. The bright yellow-green color is reserved exclusively for pedestrian and school-related warning signs — it was adopted by the MUTCD to maximize visibility because studies showed it is highly conspicuous in both daylight and twilight conditions.
Where you'll see it
On roadways adjacent to elementary, middle, and high schools, and sometimes near school bus stops. The sign is typically paired with a speed limit placard (commonly 15–25 mph depending on the state) and a time-of-day restriction such as 'When children are present' or fixed hours like '7–9 AM and 2–4 PM school days.'
What to do
Reduce speed to the posted school-zone limit immediately upon passing the sign. Remain alert for children crossing, school buses stopping, and parents dropping off or picking up students. Come to a complete stop for school buses displaying flashing red lights and stop arms, regardless of which direction you are traveling (on undivided roadways).
Common mistakes
Speeding in a school zone — even by a few miles per hour — typically carries double the normal fine in many states, plus court costs. Some jurisdictions also assess double points on your driving record for school-zone violations.