Often on this blog I’ve highlighted the importance of diversity, that we as humans are all different and we have differing needs, that one size fits all approaches never work. So, I wish to discuss a very disturbing recent development with cars, that has failed to respect diversity.
In recent times there has been a trend towards ever brighter lights on cars. I used to think that it was just a few modders not considering other motorists, but they seem to have become standard on many new cars. I am talking about Xenon and LED lighting.
The idea behind these lights is that they are more energy efficient (which is great) and enable the driver to see more with there headlights (which by itself is also a good thing). However such lights dazzle other road users. Technically this is illegal:
UK Highway Code Rule 114
- use any lights in a way which would dazzle or cause discomfort to other road users, including pedestrians, cyclists and horse riders
However this rule is as far as I am aware never enforced and there is no upper brightness limit in law, so dazzle is defined as being subjective. So if I experience dazzle then technically a vehicle with these lights is illegal. Yet nothing is being done about this!
It’s all of the lights on a car thus fitted, which does cause problems:
More powerful headlights allow the driver to see more and may decrease some accidents. There has always been the problem of headlights at night causing reduced visibility to on coming drivers and drivers have developed strategies to cope with this. However when the brightness is increased the danger of decreased visibility to other drivers is increased which may increase accidents. There is a balance to be achieved here. However there is no mechanism in place to ensure the safest balance is achieved.
Day Running Lights
What is the point of these, other than to dazzle other drivers? They offer the driver no increased clarity, merely decrease other drivers vision.
Rear Running Lights
These are essential at night so other drivers are can be aware of other active vehicles. However, dazzling the car behind doesn’t help anyone. Most rear running lights are not too bright until brakes are applied
Rear Brake Lights
Perform the vital role of signaling following drivers of braking, that the car is slowing down and that the driver may have spotted a hazard ahead. However id they are too bright, as many of them are now, they dazzle the following drivers, causing them to be able to see less, which has no advantages.
Stationary Brake Lights
When I learnt to drive, the importance of Handbrake – Neutral was drummed into me. This action switches off the rear brake lights, mainly for safety in a collision but also to stop dazzling the driver behind.
Now, sometimes, we are lazy and we hold our cars on the foot brake. This didn’t cause dazzle problems for most people as the lights were not overly bright and on older models of cars the lights were lower down on the car body, more importantly below eye height, so the light wasn’t directly in the centre of the field of vision. This is an increasing problem as most drivers where I live have dropped the Handbrake – Neutral action when stopped temporarily and more worryingly some modern cars which switch the engine off to save fuel when stationary keep the rear brake lights burning holes in following drivers retinas, well give us sun spots anyway. The problem with this is that the following drivers eyes adjust to the bright light, so for a while afterwards their vision is dimmed, which has safety consequences.
So how did we get to a point where new cars are not designed to be safe?
Part of the issue is that we are all different and have different light sensitivity. I raised this issue with friends and colleagues and most people don’t find these brighter lights dazzling or a problem, even though their vision is still dimmed. However I realised that I am not alone, there seems to be a significant minority of people who are more light sensitive, for whom brighter lights are more dangerous.
Remember we are all different and even see the world in different ways. For example, I didn’t realise quite how prevalent various forms of colour-blindness are. So the needs of the light sensitive should be taken into account when designing and regulating cars on the roads.
There doesn’t seem to be any action on this front. I wrote to the government and they are not even looking into this issue. The difficulty is that the car manufacturers lobby governments for minimal regulations, as surely the market will regulate for safety as it is what drivers want.
However, in this case, market forces don’t work. If your car dazzles others it doesn’t affect you as driver, all you see is your slight improvement in visibility, the negative effect is suffered by other road users. But other road users have zero influence on your choice of car and it’s lighting. Having a really bright car that is more noticed may mean that there is a decreased chance of other people running into you, however when all cars are overly bright this advantage is lost and everyone is left with overly bright cars and the roads are overall less safe places.
It is simply dangerous to not consider the needs of others, especially when no wider advantage makes up for the loss of a particular minority. Everyday I witness inconsiderate driving that may cut a few seconds off someones journey only to slow down everyone else. What is more disturbing is when these issues are built into the cars themselves.
There is a potential solution. Driving spectacles have been developed to reduce light glare. Basically they have a yellow tint which filters out the UV/ blue light spectrum which reduces headlight dazzle. I’ll have to check these out!