Vehicle Headlight Glare Standards

Lauren Edwards Excerpts

Wednesday 29th October 2025 Westminster Hall

[Peter Lamb (Crawley) (Lab)]

I beg to move,

That this House has considered the potential merits of a new standard for vehicle headlight glare.

It is a pleasure to serve under your chairmanship, Mrs Harris. I am grateful for the opportunity to present this motion today; it is the first time that I have been successful in an application for a Westminster Hall debate, and I feel that I have been incredibly lucky with the coverage that it has received so far in the news. But I suppose that I should not be surprised. This issue has been raised with me by many constituents, and polling indicates that 80% of all drivers are concerned about headlight glare. I am sure that most Members have at one time or another struggled to see the road because of the glare of oncoming headlights—I certainly have.

No one should deny the valuable role that headlights play in enabling people to drive safely. They enable drivers to see potential hazards, and other people to notice vehicles in motion. It is for that reason that we encourage cyclists to ensure that their bikes are properly illuminated at night—the conversation about their lighting, and particularly the flashing lightbulbs that they often have, can wait for another day. However, in recent years the glare from headlights has begun to tip over from enhancing road safety to compromising it. On average each year, police are called to 280 collisions and six fatal collisions where headlight glare is cited as having played a role in causing the accident.

Several factors have a role to play in driving the increase in headlight glare. Poor alignment of headlights means that often car headlights are angled too high up in the road, and consequently the light enters into cabins. There is increased adoption of SUV-style cars, which sit higher in the road, so again the light is more likely to enter a car’s cabin and impact drivers.

However, the most significant change has been the replacement of traditional halogen lightbulbs with light-emitting diodes. LEDs are a significant improvement on halogen bulbs; they are far more energy-efficient, last far longer and have the ability to be brighter and better directed than traditional lightbulbs. Unfortunately, although car companies feel the advantages of the increased brightness of LEDs—which, due to emitting large volumes of blue light, unlike halogen lightbulbs, take far longer for the eye to recover from—they do not appear to have considered the impacts on other road users. It is hard to say whether that is by accident or design. Brighter headlights may well be attractive to those purchasing a car; they can be more aesthetically pleasing, and drivers benefit from increased visibility, but that all comes at the cost of other road users.

The tension between the conflicting interests of those living in this country sits at the heart of our politics. It is our job as representatives to decide where that appropriate balance sits—curtailing the freedoms of some to protect the freedoms of others—and there will always be winners and losers. Fortunately for the Government, on this issue the balance seems clear. When four out of five drivers are telling us they are concerned about headlight glare, we know that the balance of freedoms in this country rests clearly on one side. We cannot have a road network where one in 20 people have stopped driving completely and a further 22% would rather not drive at night at all if they a choice.

[Lauren Edwards (Rochester and Strood) (Lab)]

From my hon. Friend’s research, how concerned is he about the role that increasing glare from headlights could be playing in increasing social isolation? A lot of my older constituents say they are quite frightened about going out at night, particularly in winter as the nights are drawing in, which leaves them feeling more isolated.

[Peter Lamb]

Although the researcher involved did not look into particular age groups, I think we all know that on balance, it is often older citizens who are far more inclined to feel the issue of headlights and problems with driving in general. When looking at the numbers, which show the scale of people who are simply staying at home because they no longer feel safe in the road, we realise that something clearly has to be done. The overwhelming majority of those who say that they are no longer driving at night, or would not drive if they had the choice, cite headlight glare as the primary reason.

--- Later in debate ---

[Simon Lightwood]

We will always keep all these considerations under review, but, as with anything, we will be evidence-led on the measures that we put in place, working with our international partners.

Road users will have experienced discomfort from headlamp glare when driving. From personal experience, I know that that is not pleasant. A few Members raised headlight aim, which is checked in an MOT once a year. During normal wear and tear, headlights can become out of alignment. The manual controls that many of us have to adjust our headlight focusing need to be changed if we have passengers in the back seats or luggage in the boot. Many Members I spoke to in advance of the debate did not know that, if they have luggage in their boot or people in the back seats, they should adjust their headlights. There is more education to be done there.

Over the years, the Department for Transport has raised the issue at the United Nations international expert group on vehicle lighting, and it was asked about the UK playing an international role. Following lengthy and significant negotiations, proposals to amend headlight aiming rules were agreed in April 2023, together with requirements for mandatory automatic headlamp levelling —a system that automatically recorrects the aim of the headlights based on the loading of the vehicle, to go back to the issue of when passengers are in the back seats or there is luggage in the boot. Those new requirements are expected to take effect in September 2027, to permit sufficient time for vehicle manufacturers to redesign their products and adapt the manufacturing process. Once implemented, those tougher requirements will help alleviate the number of cases where road users feel dazzled by vehicle headlamps.

There is, however, still much to do and much that we do not know about the underlying causes. To address the lack of clear evidence into which factors are impacting on drivers, the Department for Transport commissioned independent research in 2024 to understand better the root causes of the glare. Over several months, researchers gathered real-world glare data when driving at night, using an instrumented vehicle and machine learning analysis tools to determine the main factors that influence glare. That work was recently completed, and the final report is due to be published in the next week.

As might be expected, the results indicated that road geometry, in combination with brightness, is a key factor in glare events. The second most important factor, however, was identified to be vehicle type, suggesting that certain vehicle characteristics may be contributing to problems of glare. Given the findings of this innovative and groundbreaking research, the Department plans further research examining a range of vehicle makes and models, aimed at identifying what vehicle design factors may be responsible for increased glare. That can then be used to generate proposals for amendments to the international vehicle lighting regulations at the United Nations.

[Lauren Edwards]

Given that SUVs, which are generally larger, higher cars and have LED lights, now make up more than half of new cars sold in the UK and demand is growing, does the Minister agree that it is critical that the Government address this issue urgently?

[Simon Lightwood]

I heed the comments of my hon. Friend. Again, it is important that we are evidence-led, hence the commissioning of further research to drill down on the cause and effect.

In parallel, the Driver and Vehicle Standards Agency, which leads for the Department on market surveillance of vehicles and automotive components, has stepped up its activities to intercept the sale of illegal retrofit headlamp bulbs for on-road use, which we believe is one of the contributing factors. Anyone caught could face a fine of £1,000. The Department is also an active member of the Euro NCAP consumer information programme, which assesses a range of vehicle characteristics to determine a vehicle’s safety rating. Work is under way to develop a new vision protocol for 2029, which is planned to include an assessment of vehicle lighting systems to ensure that they provide forward vision while minimising the risk of dazzle for some road users.

Much has already been achieved, but we have listened and we understand that more can and must be done. We will continue to develop the evidence and work domestically and with our international partners to help ensure that people feel able to drive at night without experiencing glare or dazzle.