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School Bus Stop Ahead Sign: Meaning and What to Do

The yellow-green pentagon with a bus symbol warns that a school bus stop lies ahead where you cannot see it in time, beyond a crest, a curve, or vegetation. It is posted where a stopped bus with its red lights and stop arm would otherwise appear too suddenly to obey.

School Bus Stop Ahead Sign (S3-1), official design
The sign

School Bus Stop Ahead Sign

  • MUTCD S3-1
  • Pentagon
  • Fluorescent yellow-green with a black bus and figures symbol
  • School sign

It extends the school-sign family's promise: children near the road. Here the specific picture is a bus you will have to stop for and children converging on it or crossing away from it, on both sides of the road.

What to do

What to do when you see the school bus stop ahead sign

Slow down and be ready to stop for a school bus that may be loading beyond your sight line. Remember the stopping law it points to: red flashing lights and an extended arm stop traffic in both directions on undivided roads, until the lights stop, not merely until the door closes.

The signs it is confused with

Tests pair it with the school crossing pentagon, same shape and color for a crossing rather than a bus stop, and with the school-bus stopping rules themselves. The pentagon plus a bus symbol always reads: hidden bus stop ahead, slow now.

Try it

Signs are one topic of ten on every test

Every state practice test covers signs, signals, and markings among its ten topics, with every answer explained. Pick your state and see how its exam asks about signs like this one; it is free, with no sign-up.

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Questions

Questions about the school bus stop ahead sign

What does the school bus stop ahead sign mean?

A school bus stop is ahead where sight distance is short. Slow down and be ready to stop for a loading bus you cannot see yet.

Why is the sign needed if buses have flashing lights?

Because the lights become visible only when the bus does; beyond a crest or curve that can be too late at speed. The sign buys the braking distance the geometry took away.

What do I do when the bus's red lights are flashing?

Stop in both directions on an undivided road, back from the bus, and stay stopped until the lights stop and the arm folds. Divided-road exceptions vary by state, and each state's test uses its own rule.

What color and shape mark school signs?

Five-sided pentagons in fluorescent yellow-green, reserved for school areas: crossings, zones, and bus stops. The shape reads at a distance before the symbol does.

How is this sign tested?

As pentagon-family identification and inside school-bus stopping scenarios, the most heavily penalized rule family on every state's exam.