When to Use Different Types of Car Lights While Driving
Car lights are one of the most important safety features on your vehicle, yet many drivers aren’t always sure which lights to use and when. Using the wrong lights or forgetting to use them at all can reduce visibility, confuse other road users, and even result in fines.
This guide explains the different types of car lights, what they’re for, and when you should use them while driving.
Why Using the Correct Car Lights Matters
Your car lights don’t just help you see, they help others see you. Correct use improves road safety, reduces accident risk, and ensures you stay compliant with UK driving laws.
Sidelights (Parking Lights)
When should you use sidelights?
Sidelights are designed to make your vehicle visible when parked or driving in low-light conditions.
You should use sidelights:
- At dusk or dawn when visibility is reduced
- When parked on a road with a speed limit over 30mph at night
⚠️ Sidelights alone are not bright enough for driving in darkness and should not be used as a substitute for headlights.
Dipped Headlights
When should you use dipped headlights?
Dipped headlights are the most commonly used lights and should be your default when visibility is reduced.
Use dipped headlights:
- Between sunset and sunrise
- In rain, fog, or mist
- When visibility drops below 100 metres
- On poorly lit roads
Dipped headlights illuminate the road ahead without dazzling oncoming drivers.
Main Beam Headlights (Full Beam)
When should you use full beam headlights?
Main beam headlights provide maximum visibility but must be used responsibly.
Use full beam headlights:
- On unlit roads at night
- When there is no oncoming traffic
You must dip your headlights when:
- Another vehicle is approaching
- You’re driving behind another car
- You could dazzle pedestrians or cyclists
Fog Lights (Front and Rear)
When should you use fog lights?
Fog lights should only be used in seriously reduced visibility.
Use fog lights:
- When visibility is less than 100 metres (about the length of a football pitch)
🚫 Do not use fog lights in rain or normal darkness, they can dazzle other drivers and are illegal if used incorrectly.
Daytime Running Lights (DRLs)
When should you use daytime running lights?
DRLs turn on automatically when the engine starts and help make your vehicle more visible during the day.
Important to note:
- DRLs do not replace headlights
- They may not activate rear lights
- You still need dipped headlights in poor visibility
Brake Lights
When do brake lights activate?
Brake lights come on automatically when you apply the brakes, warning drivers behind you that you’re slowing down.
If your brake lights aren’t working correctly, they can be dangerous and lead to MOT failure, something Summit Garage can check during routine servicing.
Indicators
When should you use indicators?
Indicators communicate your intentions to other road users.
Use indicators:
- When turning or changing lanes
- When pulling out or parking
- At roundabouts
Always indicate in good time, even if the road appears clear.
Hazard Warning Lights
When should you use hazard lights?
Hazard lights warn other drivers of a potential danger.
Use hazard lights:
- If your vehicle breaks down
- If you’re involved in an accident
- To warn of a sudden hazard ahead (brief use only)
They should not be used as a parking substitute unless permitted.
Interior Lights
Should you drive with interior lights on?
Driving with interior lights on at night can cause glare and reduce visibility. They should only be used briefly when stationary.
Final Thoughts
Knowing when to use each type of car light helps keep you safe, visible, and compliant with the law. If you’re unsure whether your lights are working properly or if warning lights appear on your dashboard, it’s best to have them checked promptly.
At Summit Garage, we can inspect, replace, and repair all vehicle lighting to ensure your car is safe and road-ready all year round.