Are Yellow DRLs Legal in the UK? A Comprehensive Guide on Daytime Running Light Colours

In recent years, yellow DRLs (Daytime Running Lights) have seen a surge in popularity. BMW sparked this trend by including yellow DRLs in their M4 & M3 CSL editions, and now, yellow DRLs are becoming a popular retrofit across multiple car brands. However, many drivers wonder: Are yellow DRLs legal in the UK? Here's everything you need to know.

A Brief History of Yellow Headlights

The use of yellow headlights dates back nearly 90 years. In 1937, the French government mandated that all civilian vehicles use yellow headlights to distinguish them from enemy vehicles during World War II. Since then, yellow lighting has been associated with increased visibility in difficult conditions. Fog lights, for instance, are often yellow to improve contrast in foggy weather.

In motorsports, such as Le Mans racing, yellow lights are used to differentiate between vehicle classes, making it easier for drivers to identify competitors on the track. BMW’s racing heritage likely inspired the use of yellow DRLs in its production vehicles, continuing the brand’s tradition of “Racing DNA” across its models.

Understanding UK DRL Colour Regulations

According to the UK’s Road Vehicles Lighting Regulations 1989, the legality of DRL colours is specific and slightly nuanced. Below are the acceptable colours for front position lamps (DRLs):

1. White Light: The standard, most common colour.
2. Predominantly White with a Blue Tinge: Some DRLs may have a slight blue tint while remaining primarily white.
3. Yellow Light: Yellow DRLs are acceptable if combined in a yellow headlamp.

Source: The Road Vehicles Lighting Regulations 1989, UK Gov

Are Yellow DRLs Legal on Their Own?

In most UK vehicles, DRLs are clear, not yellow, and simply emit a yellow light. This can technically be flagged as a “minor” in the MOT if the colour is deemed outside the acceptable range. However, it would not be a “major” defect, meaning it’s not a reason for an MOT failure.

Important: No headlight colour should resemble those used by emergency services (such as red, blue, or green), as this is strictly prohibited.

Summary of Key Points for Yellow DRLs

• Yellow DRLs Are Generally Acceptable: While white is standard, yellow is legally permissible in specific configurations.
• Minor MOT Note: If your DRLs are yellow but your headlamp is clear, it might be noted as a “minor” during your MOT, but it won’t cause a failure.
• Avoid Emergency Colours: Red, blue, and green lights are reserved for emergency vehicles and are not allowed on regular cars.

Yellow DRLs provide a distinct look that recalls both historic and performance-focused roots. With increased demand, retrofitting yellow DRLs is now a common option for many car brands, giving drivers a unique and legally acceptable lighting choice. If you’re considering adding yellow DRLs, rest assured that in most cases, they’re fully compliant with UK regulations.