An amber light on its own means stop at the stop line. You may only proceed if stopping safely before the line is impossible.
Understanding the correct response to an amber light prevents rear-end collisions and intersection light-running.
What this sign means
The single amber signal indicates that the green phase has ended and a red light is about to be displayed.
It commands drivers to stop, allowing only exceptional safety exemptions when stopping sharply could cause an accident.
What to do when you see it
React appropriately according to your speed and distance from the stop line:
Key rules:
- Stop safely behind the stop line if you have time and distance to brake normally.
- Only continue through if you have already crossed the line or are so close that braking hard might cause a collision.
How this sign is tested
Theory test questions probe the exact definition of amber: stopping is mandatory unless it is unsafe to do so.
Scenario-based questions assess driver decision-making when approaching amber lights.
Common mistakes
Accelerating to beat an amber light before it turns red.
Slamming on brakes unnecessarily when comfortably past the point of safe stopping.
Test yourself on this one
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Practise road sign questionsFrequently asked questions
Is it legal to drive through an amber light?
It is only legal if stopping safely before the stop line is not possible.
What light comes after a single amber light?
A single amber light is followed immediately by red.
Why does the UK use amber lights?
The amber light provides a safe transition period between green and red signals.