Filter Lanes and Green Filter Arrows on Your Driving Test in 2026: How to Handle Them

Filter lanes and green filter arrows are one of those parts of driving that never quite get a lesson of their own. They appear in the Highway Code, your instructor points one out in passing, and then you are expected to handle them correctly under test conditions. Get them wrong on your driving test in 2026 and you can pick up anything from a minor fault for poor positioning to a serious fault for blocking a lane or moving off when the arrow was not for you.

The good news is that filter lanes follow simple, consistent rules. Once you understand what a filter lane is asking of you — and, crucially, what a green arrow does not give you permission to do — they become one of the easier features of a test route.

What Is a Filter Lane?

A filter lane is a marked lane at a junction reserved for traffic going in one particular direction, usually left or right. It lets that traffic queue separately from vehicles going straight on, so the junction flows better.

You will meet three broad types on UK roads:

• Left filter lanes — a dedicated lane for left-turning traffic, sometimes allowing you to turn left while the main lights are red, but only where a separate green arrow or a ‘left turn on red’ sign permits it.
• Right filter lanes — a central lane or hatched-off area for right-turning traffic, common on wider roads and at traffic light junctions.
• Slip road style filters — a lane that leaves the main carriageway before the junction entirely, often with its own give-way line.

Green Filter Arrows: What They Actually Mean

A green filter arrow gives you priority to travel in the direction the arrow points, and only that direction. It does not mean the junction is clear for all movements, and it does not override your duty to check that the way ahead is safe.

• A green arrow alone (with the main light red) means you may go in the arrow’s direction if it is safe. Traffic going any other way must wait.
• A green arrow shown with a full green light usually means the opposing traffic is being held, so a right turn can be made without waiting for a gap — but the arrow can disappear before the green does.
• If the arrow goes out while you are still waiting, you are back to normal rules: give way to oncoming traffic before turning right.

How to Use a Filter Lane on Your Test

1. Read the road markings early. Arrows painted on the carriageway usually appear well before the junction. They are your first and best warning.
2. Mirror, signal, position. Check your mirrors, signal in good time, then move into the filter lane. Do not drift across and signal afterwards.
3. Get in the lane before the solid white line. Crossing a solid line to enter a filter lane at the last moment is both unsafe and markable.
4. Do not use a filter lane to overtake a queue unless you are genuinely turning in that direction. Using a left filter lane to get past traffic and then going straight on is a serious fault.
5. Check the arrow, then check the road. A green arrow means you have priority, not that the junction is empty. Look for pedestrians, cyclists and vehicles still clearing.
6. Keep the filter lane clear if you are not turning. Sitting in a right filter lane while intending to go straight on blocks the junction and will be marked.

Filter Lanes and Vulnerable Road Users

The 2022 Highway Code hierarchy of road users, still in force in 2026, matters here. When you use a left filter lane, cyclists may be continuing straight ahead on your left, and pedestrians may be crossing the road you are turning into. Rules H2 and H3 make your responsibilities explicit:

• Give way to pedestrians crossing or waiting to cross the road you are turning into.
• Do not cut across cyclists, horse riders or motorcyclists going straight ahead when you are turning.
• Check your left blind spot before every left filter turn, not just your mirror.

Advanced stop lines — the boxes at traffic lights reserved for cyclists — often sit alongside filter lanes. Stop at the first white line if the lights are red, and never encroach into the cycle box.

Common Filter Lane Faults on the Driving Test

• Moving off on someone else’s green arrow. The single most serious filter lane mistake, and an instant fail.
• Late lane entry. Swinging into the filter at the last second, often across a solid line.
• Blocking the filter. Waiting in a turning lane when going straight on.
• No blind spot check. Turning left across a cyclist who was already alongside you.
• Hesitation. Sitting still on a green filter arrow because you were not sure it applied to you. Read arrows in advance and the doubt disappears.
• Poor positioning within the lane. Straddling the line between the filter and the straight-on lane leaves other drivers unable to predict you.

How to Practise Filter Lanes Before Your Test

Filter lanes are location-specific. The junctions near your test centre will have their own layouts, arrow timings and traffic patterns, and reading about them is no substitute for driving them.

The Exam Routes App gives you real driving test routes with turn-by-turn navigation, so you can drive the actual junctions your examiner is likely to use. Approach each filtered junction from every direction, at different times of day, until the lane choice happens without thought.

• Drive the same junction three or four times in a session, from different approaches.
• Have your supervising driver call out the arrow you should be watching, then swap and call it yourself.
• Practise at a busy time. An empty filter lane teaches you nothing about queueing and lane blocking.
• Note where solid lines begin so you know your last safe moment to change lanes.

Frequently Asked Questions