What Are Dipped Headlights (Nærlys)?

Dipped headlights, known as 'nærlys' in Denmark, are the standard forward illumination system on a vehicle. They are designed to provide sufficient light to see the road ahead for at least 30 meters, while also preventing glare for drivers coming from the opposite direction or those you are following. In Denmark, these lights are engineered to emit an asymmetric beam, illuminating the right side of the road further than the left, with a slight downward fall of approximately 1% (or 1 cm per meter) to maximize visibility without dazzling others.

Mandatory Use in Denmark

A unique and critical aspect of Danish traffic law is the mandatory use of dipped headlights at all times, day or night, regardless of weather conditions. This means that whenever you are driving in Denmark, your dipped headlights (or approved daytime running lights if your vehicle is equipped with them) must be switched on. This regulation significantly enhances road safety by ensuring all vehicles are highly visible to other road users, including pedestrians and cyclists, even on clear, sunny days. This is a common point of confusion for drivers from countries with different lighting regulations and is a frequent topic in the Danish driving theory exam.

When to Use Dipped Headlights in Specific Conditions

While generally always on, dipped headlights become even more critical in adverse conditions or specific traffic situations:

• Poor Visibility: In fog, heavy rain, mist, or snow, dipped headlights are essential. They cut through the poor visibility better than daytime running lights alone, making your vehicle visible and illuminating the immediate road more effectively. Parking lights (positionslys) are never sufficient in these conditions.
• Tunnels: Upon entering a tunnel, dipped headlights must be switched on immediately, even if the tunnel is well-lit. This ensures continuous visibility and compliance with the law.
• Dusk and Dawn: As natural light fades or emerges, dipped headlights provide the necessary illumination for clear vision and ensure you are seen by others.
• Overtaking: When overtaking another vehicle, especially at night, you may temporarily use full beam (fjernlys) to improve your vision during the maneuver. However, you must switch back to dipped headlights as soon as you begin to move back into your lane or if there's any risk of blinding the vehicle you're overtaking or oncoming traffic through their mirrors.
• Following Other Vehicles: When following another vehicle, you must use dipped headlights to avoid blinding the driver in front through their rearview mirrors, even if full beam would otherwise be permissible.

Dipped Headlights vs. Other Lighting

It's important to distinguish dipped headlights from other vehicle lighting systems:

• Daytime Running Lights (DRL): Many modern vehicles are equipped with DRLs, which automatically switch on with the engine. If your car has DRLs, these are generally sufficient during daylight hours in Denmark. However, DRLs do not typically illuminate the road behind you or provide the same level of forward illumination as dipped headlights, especially in poor visibility.
• Full Beam (Fjernlys): Full beam headlights provide maximum forward illumination and should only be used on unlit roads where there is no oncoming traffic or vehicles ahead that could be blinded. Always switch to dipped headlights well in advance when approaching other road users.
• Parking Lights (Positionslys): These are very low intensity lights intended for use when your vehicle is parked or stopped on an insufficiently lit road, making it visible to others. They are never to be used for driving, especially not in conditions requiring dipped headlights.
• Fog Lights (Tågeforlys): Fog lights are supplementary lights that can be used in conjunction with dipped headlights during fog, heavy rain, or similar conditions to improve close-range visibility. They are not a substitute for dipped headlights.

Safety and Exam Relevance

The Danish requirement for continuous dipped headlight use underscores a strong emphasis on road safety and mutual visibility. Theory exam questions often test your knowledge of when and how to use different lights, particularly highlighting the mandatory 'nærlys' rule and the distinction between dipped headlights and daytime running lights. Proper use ensures you can see and be seen, significantly reducing the risk of accidents.