Filter lights, often referred to as filter arrows, are specific green arrow signals at UK junctions. They indicate that traffic turning in the direction of the arrow has priority to proceed, as conflicting traffic streams are stopped by red lights. Understanding how to react to these signals is vital for both the hazard perception and multiple-choice sections of your DVSA theory exam, as well as safe daily driving on Great Britain's roads.
A traffic signal phase featuring a green arrow that gives drivers priority to turn in a specific direction while conflicting traffic is stopped.
Arrow points green, priority is seen—but scan the whole scene for hazards unseen.
Quickly understand the most important facts, rules, and meanings related to Filter Lights in British driving theory for Great Britain. This focused summary helps learners revise key terminology, traffic concepts, and exam-relevant knowledge efficiently.
See how Filter Lights appears in realistic driving situations relevant to Great Britain. These examples explain correct behaviour, safety implications, and how Filter Lights connects to British driving theory exam questions.
You are waiting at a red traffic light in the right-hand filter lane of a dual carriageway in Birmingham. The main traffic light remains red, but a green arrow pointing to the right illuminates.
Check your mirrors, look ahead to ensure the intersection is clear of pedestrians and turning vehicles, and then proceed to make your right turn safely.
The green filter arrow indicates that oncoming traffic has been stopped by a red signal, granting you priority to complete your turn.
You are driving on a multi-lane approach to a junction in Glasgow. You are in the middle lane, which is marked for going straight ahead. The left-turn filter arrow turns green, but the main light for your lane remains red.
Remain stopped behind the white stop line in your lane and wait for the main light to turn green.
A filter light only applies to drivers positioned in the specific lane corresponding to the direction of the arrow.
You are turning right at a junction in London. The main green light is on, but the right-turn green filter arrow has not lit up. Oncoming traffic is heavy.
Drive forward past the stop line into the junction, wait in a safe position without blocking oncoming traffic, and complete your turn only when there is a safe gap in oncoming vehicles.
The main green light permits you to enter the junction, but without the filter arrow, you do not have exclusive priority and must yield to oncoming traffic.
Learn how to correctly respond to green filter arrows at traffic signals, maintain lane discipline, and understand priority rules under the Highway Code.
Filter lights, commonly known as "filter arrows," are auxiliary signals attached to standard traffic lights at junctions across England, Scotland, and Wales. While a standard round green light permits traffic to proceed in any direction that is not legally prohibited, it does not guarantee a clear path. A green filter arrow, however, indicates dedicated priority for vehicles travelling in the direction the arrow points.
According to the Highway Code, these arrows are designed to ease traffic congestion at busy intersections. They allow specific lanes of traffic—usually those turning left or right—to move independently of the main traffic flow. The filter arrow may illuminate before, during, or after the main green light phase, depending on the design and programming of the specific junction.
When a filter light illuminates green, it signifies that the oncoming traffic or pedestrian crossing that would normally cross your path is currently held by a red signal. This provides a "protected" window to complete your turn safely.
However, lane discipline is critical. You must only benefit from a filter arrow if you are positioned in the correct, designated lane for that turn. If you are in a lane marked for ahead-only traffic and a right-turn filter arrow lights up, you must remain stationary behind the stop line until your specific lane's signal turns green.
One of the most important concepts taught by UK driving instructors is that a green signal—including a filter arrow—is a permission to proceed, not an absolute guarantee that the road is clear. Even with a green filter light, you must still perform thorough observations before initiating your turn.
Always check for:
In the official Great Britain driving theory exam, questions regarding filter lights often test your understanding of priority and signal changes. A classic scenario involves waiting at a red light when a green left-turn arrow appears. The correct answer is that you may proceed in the direction of the arrow, provided you are in the correct lane and it is safe to do so.
Another common trick question asks what you should do if you are waiting in the middle of a junction to turn right, and the right filter arrow does not illuminate, but the main green light goes out. In this situation, if you have already crossed the first stop line, you must clear the junction safely as soon as there is a gap in oncoming traffic, rather than remaining stranded in the middle of the intersection.
Find all British driving theory study content related to Filter Lights for learners in Great Britain. Explore lessons, road sign explanations, theory units, articles, and practice materials covering the meaning, usage, and exam relevance of Filter Lights.
Get clear answers to the most searched questions about Filter Lights in British driving theory for Great Britain. This FAQ explains the definition, real exam context, practical meaning, and common learner doubts to support confident theory test preparation.
A main green light allows you to proceed in any direction if safe, but you must yield to oncoming traffic when turning right. A green filter arrow gives you exclusive priority to turn in that specific direction because conflicting traffic streams are stopped by red lights.
Yes. If the green filter arrow is illuminated, you may proceed in the direction of that arrow even if the main circular light is red, provided you are in the correct lane and the way is clear.
While you have legal priority, it is not absolute. You must always watch for pedestrians crossing the road you are entering, oncoming drivers running red lights, or emergency vehicles.
If the filter arrow goes off but the main green light remains lit, you can still complete your turn, but you no longer have protected priority. You must yield to oncoming traffic and wait for a safe gap.
Master the official UK traffic light sequences, filter arrows, and safety rules for signal-controlled junctions.
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Master essential priority rules for your DVSA theory test.
Mastering Priority: Essential Judgement for Your GB Theory Test
This regulatory sign is part of the legal control of the road. It may require a driver to stop, give way, keep to a direction, avoid a movement, stay out of a restricted area, or respect a vehicle-specific rule. In practice, the sign should be read with the stop line, lane markings, road layout, and any supplementary plates so the instruction is obeyed before the controlled point. It is listed in the catalogue as code 609.
This regulatory sign is part of the legal control of the road. It may require a driver to stop, give way, keep to a direction, avoid a movement, stay out of a restricted area, or respect a vehicle-specific rule. In practice, the sign should be read with the stop line, lane markings, road layout, and any supplementary plates so the instruction is obeyed before the controlled point. It is listed in the catalogue as code 651.
Explore our comprehensive alphabetical glossary to look up specific terms, reinforce complex driving theory concepts, and clarify every definition. Prepare effectively for the DVSA theory test by mastering essential rules for safe driving on Great Britain roads. Boost your knowledge and confidence today.
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