Yes, you can generally drive with Daytime Running Lights (DRLs) on. DRLs are designed to improve daytime visibility and are widely supported by modern vehicles. However, whether you should or must have DRLs on depends on where you are, and DRLs are not a substitute for proper headlights in low visibility conditions.
The legality and best practice around DRLs vary by country, state or province, and even local city rules. This article explains how DRLs work, where they’re required or recommended, and how to stay compliant while staying safe on the road.
What Daytime Running Lights are and how they work
Daytime Running Lights are dedicated lights that illuminate automatically in daytime to make your vehicle more conspicuous to other road users. They differ from standard headlights and taillights in purpose and brightness, and many cars control them automatically.
Key characteristics of DRLs include:
- Typically on when the engine is running, and often separate from the main low-beam headlights.
- Usually consume less power than full headlights and may be built into the headlight assembly or mounted separately.
- Intended to increase daytime visibility, not to illuminate the road like regular headlights.
- In some vehicles they can be turned off or customized, but in many models they are fixed-on in daytime.
- DRLs do not replace headlights in low light, rain, fog, or other reduced-visibility conditions.
In everyday driving, DRLs help other drivers and pedestrians notice your vehicle during daylight, but you should switch to standard headlights when visibility drops or at night.
Regional rules and guidance
United States
The United States does not have a federal DRL mandate. Whether DRLs are on or off is largely a matter of the vehicle and state law. In general, DRLs are legal to drive with, and many drivers leave them on during the day. However, several states require headlights to be on for certain conditions (for example, after sunset, in poor weather, or when windshield wipers are in use), and DRLs may not satisfy those requirements. Always check your state’s motor vehicle code or DMV guidance for specifics on headlight use and any exceptions.
Canada and Europe
In Canada, DRLs are mandatory for most new vehicles, and they are typically required to be on whenever the vehicle is operating. In practice, this means you will generally drive with DRLs during the day, and you should still use proper headlights when visibility is reduced. In the European Union, DRLs became mandatory for new cars in many countries in the 2010s, and they are commonly on by default. In the EU and the UK, DRLs are allowed and common, but they do not replace dipped headlights in low visibility or at night; drivers should switch to full headlights when required by conditions or law.
Australia and New Zealand
Australia and New Zealand have widely adopted DRLs as a daytime visibility feature on modern vehicles. Rules about when to use headlights at night or in poor visibility follow local lighting regulations, which generally require headlights after dusk or in adverse conditions. DRLs can remain on during the day, but drivers should use proper headlights as conditions require.
Because lighting regulations can change and vary by jurisdiction, you should verify the exact requirements with your local department of motor vehicles or road authority whenever you’re unsure.
Practical guidance for drivers
To stay compliant and safe, consider these best practices and checks:
- Know your local rules: Check your country, state, or province’s official guidance on DRLs and headlight use.
- Use headlights when visibility is reduced: In rain, fog, snow, or low light, switch to dipped headlights even if DRLs are on.
- Don’t rely on DRLs in place of headlights at night: DRLs are for daytime visibility and are not designed to illuminate the road like headlights.
- Check your vehicle’s manual: Some cars allow DRLs to be disabled or modified; some regions may prohibit disabling DRLs to meet legal requirements.
- Consider weather and time of day: If you’re driving near dawn or dusk, or in shaded areas, err on the side of using headlights for better visibility and compliance.
Before driving in a new region, or if you’re unsure about how your car’s lighting behaves, consult the owner’s manual and local regulations to avoid violations and stay safe on the road.
Summary
Driving with DRLs on is generally permitted and common, and DRLs help increase daytime visibility. However, they are not a substitute for headlights in low visibility or at night. Legal requirements vary by jurisdiction, so always verify local rules and adopt proper lighting practices based on conditions. When in doubt, switch to headlights as soon as conditions demand it, and keep DRLs on for daytime visibility where allowed.