31/05/2006
Understanding Daytime Running Lights and Your MOT
Daytime Running Lights, often abbreviated as DRLs, have become a common feature on modern vehicles. Their primary purpose isn't to illuminate the road ahead for the driver, but rather to enhance the vehicle's visibility to other road users during daylight hours. This increased visibility can significantly contribute to road safety by making vehicles more conspicuous, especially in adverse weather conditions or low-light situations. However, a common question that arises among vehicle owners is how these lights factor into the mandatory MOT test. This guide will delve into the specifics of DRLs and their relationship with the MOT, covering everything from their energy efficiency to the legal requirements and inspection criteria.
What are Daytime Running Lights?
Daytime Running Lights are specifically designed to be activated automatically when the vehicle's ignition is switched on. Unlike traditional headlights or fog lights, DRLs are generally less bright and are intended for use during the day, not to aid the driver's vision of the road. Their function is purely to make the vehicle more visible to pedestrians, cyclists, and other motorists. This proactive approach to safety aims to reduce the likelihood of accidents by ensuring vehicles are seen more readily.
Energy Efficiency of DRLs
One of the notable advantages of DRLs is their energy efficiency. Compared to conventional dipped headlights, DRLs consume a significantly lower amount of energy. Typically, they use only about 25-30% of the energy required to power a standard dipped headlight. This reduced energy consumption not only contributes to better fuel economy but also places less strain on the vehicle's electrical system and battery. For instance, if a dipped headlight consumes around 55 watts, a DRL might only use 15-20 watts.
Legislation and DRLs
The inclusion of DRLs as standard equipment on vehicles is largely driven by European Union (EU) legislation. Since 2011, DRLs have been mandatory for all newly manufactured cars and small delivery vans within the EU. This mandate was extended to trucks and buses in August 2012. It's important to note that this legislation applies to new vehicles registered after these dates. Vehicles produced and registered before these dates are not legally required to be retrofitted with DRLs. However, if a vehicle is equipped with DRLs, whether factory-fitted or aftermarket, they must function correctly.
DRLs and the MOT Test
The MOT test is a crucial annual inspection designed to ensure that vehicles are safe and environmentally compliant. The question of whether DRLs are a mandatory part of the MOT test is nuanced. The key principle is that if a vehicle is fitted with DRLs, they must be in a good condition and operate as intended. They are not a mandatory requirement for all vehicles to pass the MOT, especially for older vehicles that were not originally equipped with them. However, for vehicles that do have DRLs fitted, the following applies:
Inspection Criteria for DRLs in the MOT
- Functionality: DRLs must switch on automatically when the ignition is turned on and switch off or dim when the headlights are activated. This automatic operation is a key aspect of their design and safety function.
- Condition: The DRL units themselves must be in good condition. This means they should not be cracked, damaged, or excessively faded. The lenses should be clear and free from obstruction.
- Mounting: DRLs must be securely mounted to the vehicle. Loose or poorly fitted DRLs can be a safety hazard and will result in a fail.
- Visibility: The lights must emit a white light, and they must be visible from the front of the vehicle.
- Number of Lights: Generally, vehicles are expected to have two DRLs fitted, one on each side of the front of the vehicle.
When DRLs Can Cause an MOT Failure
A vehicle will fail its MOT if its DRLs are not working correctly or are in a poor condition. Specific reasons for failure related to DRLs include:
- Inoperative DRLs: If the DRLs do not illuminate when they are supposed to.
- Incorrect Operation: If DRLs do not switch off or dim when the main headlights are turned on.
- Damaged Units: Cracked, broken, or severely discoloured DRL units.
- Loose Mounting: DRLs that are not securely attached to the vehicle.
- Wrong Colour Light: DRLs emitting a colour other than white.
- Excessive Number of Lights: While not common, having an excessive or improperly configured number of auxiliary lights that mimic DRLs could be an issue.
DRLs and Headlights: A Comparative Look
It's important to distinguish DRLs from other vehicle lighting systems, particularly headlights. Here's a brief comparison:
| Feature | Daytime Running Lights (DRLs) | Dipped Headlights |
|---|---|---|
| Primary Purpose | Increase vehicle visibility to others during the day | Illuminate the road ahead for the driver |
| Activation | Automatic (when ignition is on) | Manual (driver-controlled) |
| Brightness | Lower intensity | Higher intensity |
| Energy Consumption | Low (approx. 25-30% of dipped headlights) | Higher |
| MOT Relevance | Must be functional and in good condition if fitted | Mandatory functional check for all vehicles in darkness/low visibility |
| Colour | White | White or Yellow (depending on regulations) |
Aftermarket DRLs and the MOT
For owners who choose to retrofit their vehicles with aftermarket DRLs, it's crucial to ensure they meet the relevant standards and are installed correctly. The DVSA (Driver and Vehicle Standards Agency) has specific guidelines for aftermarket lighting. Ensure that any DRLs you purchase are E-marked or otherwise certified for use on UK roads. Improper installation or non-compliant lights can lead to an MOT failure. It's always advisable to have aftermarket lighting fitted by a qualified professional.
Frequently Asked Questions (FAQs)
1. Are DRLs mandatory for my car in the UK MOT?
No, DRLs are not mandatory for all vehicles to pass the MOT. However, if your vehicle is equipped with DRLs, they must be in working order and meet the specified conditions for the test.
2. My car is older than 2011. Does it need DRLs for the MOT?
No. The EU legislation mandating DRLs applies to new vehicles registered from 2011 onwards. Older vehicles that were not originally fitted with DRLs are not required to have them for their MOT test.
3. Can I fail my MOT if my DRLs are too bright?
DRLs are designed to be less bright than dipped headlights. If your DRLs are excessively bright, they might be considered non-compliant or incorrectly fitted auxiliary lighting, which could lead to a failure. The key is that they should not be dazzling to oncoming traffic.
4. What happens if only one DRL is working?
If only one DRL is working, the vehicle will likely fail the MOT because the lighting system is not functioning as intended and is not symmetrical, which is a safety requirement for vehicle lighting.
5. Do DRLs need to turn off when the headlights are on?
Yes, a correctly functioning DRL system should automatically dim or switch off completely when the vehicle's main headlights or side lights are activated. This is part of the operational requirement checked during the MOT.
Conclusion
Daytime Running Lights are a valuable safety feature that enhances vehicle visibility. While they are not a universal requirement for passing the MOT, their presence on a vehicle means they are subject to inspection. Ensuring your DRLs are functional, correctly installed, and in good condition will help you avoid any unexpected failures during your annual MOT test. Always refer to the latest DVSA guidelines or consult with a qualified mechanic or MOT centre if you have any doubts about your vehicle's lighting systems.
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