Road Safety: Headlight Glare

Carla Lockhart Excerpts

Wednesday 8th May 2024 Westminster Hall

[Martin Vickers]

The hon. Gentleman makes an extremely valid point. Nighttime driving is very different from normal daytime driving. Perhaps consideration should be given to whether that should be part of the driving test.

It is a statement of the obvious that vehicle headlights are crucial in enabling drivers to travel safely in the dark or in poor weather conditions. They are required to identify signs, bends, obstacles and other road users, pedestrians in particular, and to make their vehicle visible to others. Over the last 20 years, however, vehicle lighting technology has changed rapidly, from halogen to high-intensity discharge to light-emitting diodes. I appreciate that they are slightly different technologies, but I will use LED as an all-encompassing shorthand for the various alternatives.

In general, LED vehicle headlights are advantageous for sustainability and the driver’s view of the road ahead, but they do also cause problems. Although I intend to focus on high-intensity headlights, it is worth highlighting that dazzling taillights, front and rear indicators, fog lights and reversing lights may also cause concerns about glare in various situations.

Dr John Lincoln of LightAware explains that, although the human eye can adapt to a wide range of light levels, from bright sunlight to almost total darkness, it cannot adapt in a short space of time. Comfortable vision requires a limited range of light levels at any particular time. LED vehicle headlights are much bluer and brighter than the halogen headlights of the past. Halogen headlights are usually around 3,000 lumens, but LED lights are commonly double that, with a colour temperature of 6,000 Kelvins, which is much bluer than that of halogen bulbs.

In January, the RAC published the results of research conducted with 2,000 drivers. It found that 89% of drivers think that some or most vehicle headlights on the UK’s roads are too bright, while 74% said that they are regularly dazzled by them while driving. What is more, it has probably not gone unnoticed that there are a lot more large cars on the roads nowadays. Sport utility vehicles sit high off the ground and are particularly likely to cause glare. About six in 10 drivers of conventional vehicles blame the higher angle of SUV headlight beams. All that ought to suggest that vehicle headlight design needs a rethink.

Although the hazard caused by headlights is primarily due to unregulated luminance and blue wavelength light, as existing standards largely predate modern vehicle designs, some may argue that it would be best simply to enforce the highway code, rule 114 of which states:

“You MUST NOT use any lights in a way which would dazzle…other road users”.

Personally, I would show caution here. Much of the issue is down to new, supposedly intelligent technology that largely takes control of the headlights from the driver. Although the driver can override the technology, it can be difficult to know when to do so. I would much rather see that resolved by fixing technology than by punishing motorists, who may be unaware of the issue that they cause, not to mention the fact that it would be practically impossible to police, as we know that officers cannot be on every corner.

In built-up areas, sleeping policemen, or speed bumps, cause oncoming vehicles suddenly to angle upwards, frequently shining their headlights directly into the eyes of oncoming traffic. Similarly, a driver properly in control on a dark country road can see vehicles approaching and dip their full-beam headlights, even if other vehicles are around the bend or over the brow of a hill. Matrix lighting systems are LED headlights made up of multiple units, and portions of the lamp can switch on and off automatically depending on road conditions, but they do not have human anticipation and switch off only when they directly sense the oncoming headlights, which can be too late to avoid blinding the oncoming driver.

Having set out to raise the issue, I consulted with a range of organisations, such as the RAC, the College of Optometrists and LightAware, which have done their own research into the matter. I also point to the noble lady Baroness Hayter, who has been campaigning on this issue in the other place. All of them told me that this is a very real issue for all motorists, but particularly those over 60, about half of whom, according to the College of Optometrists, have early-stage cataracts in one or both eyes, which make them even more vulnerable to the glare from bright headlights.

LightAware reports that, as a result of headlight glare, many drivers are restricting themselves to driving in the daytime and purposely avoid driving at night. The RAC’s study found that as many as 14% of drivers aged 65 or over—more than one in 10—find glare such a problem that they have stopped driving at night. That has two primary impacts. First, the individual is less able to get out and less flexible in making medical appointments or seeing friends, leading to increased social isolation. Secondly, it reduces the number of reports into the issue of headlight glare, making it appear to be less of an issue than it really is.

Data from the United States shows that up to 15% of accidents are caused by glare from headlights—which, given its stance today, makes the Department for Transport look like it is frankly in a state of denial. The DFT has stated that its statistics show little or no contribution from dazzle to collisions, despite the fact that official Government data shows that, since 2012, there has been an average of 279 collisions a year where dazzling headlights were a contributing factor. Of those, six were fatal collisions. Given that many are no longer driving at night to avoid the problem, the figures would almost certainly be higher if those people were to travel after dark. The DFT’s stance is also unfounded given that, as far as I am aware, it has not undertaken any research. I am pleased that that is due to change once the independent study gets under way. When the Minister responds, I hope he will start by acknowledging the problem and expand a little on the Department’s plans for that research.

The Minister will be aware that others have done their own research already. The Royal Society for the Prevention of Accidents states that

“between the ages of 15 and 65, the time it takes to recover from glare increases from one to nine seconds.”

When travelling at 30 mph, that equates to travelling 13 metres for a young person and 117 metres for someone aged around 65. At 60 mph, that equates to an older person travelling 229 metres. Imagine the potential damage that could be caused by travelling 229 metres while visually impaired.

Plainly, this is not a problem reported just by UK drivers. I have mentioned the case of the United States. Similarly, a number of RAC-equivalent organisations around the world have conducted their own studies and reached the same conclusions. Organisations in Germany, the Netherlands, Belgium, Norway, Austria, Switzerland, Slovenia, and Bosnia and Herzegovina are finding the same results across Europe, based on substantial levels of response from their club members, who are calling for effective measures to substantially reduce the glare caused by road vehicles.

I make that point to highlight the scale of the problem. However, I trust that the Minister will not present that as a reason why change is not possible. The UK can certainly play a part in addressing the wider issue, but it is also something we can address alone, using our own laws and regulatory frameworks. A group chaired by Baroness Hayter produced a report featuring contributions from drivers, light experts and consumer champions. They reviewed information from optometrists, medical experts and European specialists, as well as transport research, and made recommendations to Government—a number of which I will put to the Minister directly.

[Carla Lockhart (Upper Bann) (DUP)]

I commend the hon. Gentleman for securing this timely debate. He will be aware that the investigation concluded that 44% of drivers think dazzle could be caused by badly aligned headlights. Does he agree with me that there is more that MOT centres across the United Kingdom could do to ensure that lights are aligned adequately?