Green Traffic Lights on Your Driving Test in 2026: Why You Should Never Assume They’ll Stay Green

A green traffic light does not mean go. It means you may proceed if the way is clear. That distinction sounds pedantic until you understand that a large share of driving test faults recorded at traffic lights happen on green, not red — because the candidate assumed the light would stay green, or assumed the junction beyond it was empty.

Examiners assess this under junctions and anticipation, and it is one of the easiest faults to eliminate once you know what they are looking for.

What the Examiner Is Actually Watching For

On the approach to a green light, an examiner wants to see three things:

• That you have noticed how long it has been green. A light that was already green when it came into view could change at any moment.
• That you are checking the junction itself, not just the signal. Green means your phase has priority. It does not mean the box is clear, or that a pedestrian has finished crossing, or that an emergency vehicle is not coming through.
• That your speed is appropriate to react. Accelerating hard towards a green light you cannot see the start of is poor planning.

None of this means crawling towards every green light. Hesitating unnecessarily at a light that is clearly staying green is a fault in the opposite direction — undue hesitation — and it is marked just as readily.

The Stale Green Light Problem

Instructors call a green light that has been green for a while a “stale” green. You cannot know exactly how stale it is, but you can look for clues:

• The queue has cleared. If the traffic ahead has already moved through and dispersed, the phase has been running a while.
• Pedestrian signals. At many crossings, the pedestrian phase indicators give you a warning that the sequence is progressing.
• Cross traffic behaviour. Vehicles on the side road creeping forward often means their signal is about to change.

When a green looks stale, ease off the accelerator early and cover the brake. If it changes to amber, you are already in a position to stop comfortably. If it stays green, you have lost half a second and nothing else.

What to Do When It Turns Amber

The Highway Code is clear: amber means stop, unless you have already crossed the stop line or you are so close to it that stopping might cause a collision.

In practice on test:

• If you can stop safely, stop. A controlled stop on amber is never marked as a fault.
• If stopping would mean harsh braking with a vehicle close behind, continue. That is the correct decision and examiners understand it.
• Never accelerate to beat the amber. This is the fault that turns a minor into a serious one.

The judgement call is easier if you were already at an appropriate speed. Most amber-light problems on test are really speed-on-approach problems.

Green Filter Arrows

A green arrow gives you priority to move in that direction only, even if the main signal is red. Two things catch learners out:

• Being in the wrong lane for the arrow. If the filter arrow points right and you are in the left lane, it does not apply to you.
• Assuming the arrow protects you completely. It usually does, but you should still look before you commit — particularly for pedestrians who have started crossing.

Green Lights and Box Junctions

This is where a green light most often turns into a serious fault. You may only enter a yellow box junction if your exit is clear — regardless of what the traffic light says. Entering on green and stopping in the box blocks the crossing traffic and is a reportable offence as well as a test fault.

The rule: look past the junction before you enter it. If the traffic ahead is stationary and there is no space for your car on the far side, wait behind the box even on green.

Moving Off From a Green Light

When you are stopped at a red light and it turns green, examiners watch for:

• A prompt, controlled move-off. Not a screech, not a five-second delay.
• A check of the junction before you move. Especially at crossroads, where a vehicle may still be clearing on amber.
• Correct use of the handbrake if you have been waiting more than a moment.
• A blind spot check if you are moving off from a stationary position at the front of a queue with cyclists filtering.

Cyclists filtering up the inside are the most common hazard here. Many junctions have advanced stop lines for cycles; check them before you pull away.

Five Habits That Fix Green Light Faults

1. Say “how long has that been green?” in your head on every approach. It forces the right question.
2. Ease off rather than accelerate towards any green you did not see turn green.
3. Check the exit before entering any junction, box or not.
4. Look for the pedestrian phase indicators. They tell you where in the sequence you are.
5. Practise the amber decision deliberately. Ask your instructor to talk through each one until the judgement is automatic.

How the Exam Routes App Can Help

Traffic light junctions vary enormously between test centres — some routes are full of them, others have almost none. The Exam Routes App gives you real driving test routes with turn-by-turn navigation, so you can find out which signalled junctions actually appear on your local routes and practise them repeatedly rather than hoping for the best.

Driving the same set of lights several times is the fastest way to learn how each sequence behaves.

Frequently Asked Questions