Driving in the UK means dealing with unpredictable weather, and fog is one of the trickiest conditions new and experienced drivers face. Reduced visibility can creep up on you quickly, which is why understanding when to use your fog lights is essential. In this blog, we break down the rules clearly, explain how to use fog lights responsibly, and share practical tips based on what we see learners struggle with during lessons. 

At Alfie’s Driving School, we provide reliable lessons and comprehensive courses to help you feel safe on the roads and drive with success. We teach hundreds of pupils every year how to handle real-world road situations, and foggy conditions are often where confidence drops the most. 

If you ever feel unsure about handling poor visibility or want more confidence on the road, you can always book lessons with our professional instructors. Call us on 07957 458980 or email info@alfiesdrivingschool.com to begin. 

[quote_block quote= “Alfie’s Driving School help learners build real road confidence with clear, practical guidance that prepares them for everyday UK driving conditions, from foggy mornings to winter night-time journeys. “]    

Understanding The Purpose Of Using Fog Lights In The UK 

Many drivers in the UK only think about fog lights when they fail an MOT or get flashed by another motorist, yet they play a crucial safety role. The Highway Code is particular about when you can and cannot use them, and as instructors, we notice that learners often get confused between dipped headlights, sidelights, and fog lights. So before diving into the rules, it helps to understand what these lights actually do and how they support you in poor visibility. 

1. Front Fog Lights 

Front fog lights sit low on the car and cast a wide, flat beam that cuts below the fog layer. They help illuminate the road directly in front of you when visibility is severely reduced. Because they are bright, they should only be used when necessary. 

2. Rear Fog Lights 

Rear fog lights are much more intense than standard tail lights. They exist purely to help drivers behind you see your vehicle through heavy fog, snow or spray. Misusing them can dazzle others, which is why understanding rear fog lights is essential for safe driving. 

3. Why Learners Often Misuse Fog Lights 

Learners (and even some experienced drivers) often switch them on too early because they worry about not being seen. However, using them when conditions are not severe is actually unsafe. This is why we dedicate time during lessons to both practical use and understanding the law behind fog light rules in the UK. 

When To Use Fog Lights In The UK: A Clear, Practical Guide 

The Highway Code provides strict instructions, but real-world driving requires judgement. Here is a detailed breakdown of when you should and should not use fog lights in the UK, based on both legal guidance and what we teach at Alfie’s Driving School. 

1. Use Fog Lights When Visibility Drops Below 100 Metres 

This is the most important rule. If you cannot see more than 100 metres ahead (about the length of a football pitch), you can legally use your fog lights. It applies to both front and rear fog lights. 

2. Switch Them On In Dense Fog, Not Mist 

A common learner mistake is turning on fog lights in light mist or early-morning haze. Misty conditions usually only require dipped headlights. Fog lights are for genuinely low-visibility situations. 

3. Use Them During Heavy Spray on Motorways

 Heavy spray can reduce visibility almost as much as fog. If you are driving on a fast-moving road and can barely see the vehicle ahead, rear fog lights can be justified. Still, always use caution because motorway conditions can change quickly. 

4. Turn Them Off When Visibility Improves 

Driving with fog lights on when visibility improves makes your brake lights harder to notice and can dazzle other drivers. This is one of the most common reasons people get flashed by oncoming traffic. If you can see more than 100 metres or the weather clears, switch them off immediately. 

5. Never Use Fog Lights At Night Unless It Is Foggy 

Fog lights should not be used as an alternative to full beams or dipped headlights. Night-time darkness alone is not a valid reason. They are designed for fog, snow or heavy spray, not everyday night driving. 

6. Avoid Using Fog Lights In Urban Areas With Streetlighting 

Fog lights add unnecessary glare on well-lit streets, making it uncomfortable for both pedestrians and other motorists. In towns and cities, you rarely need them unless there is genuinely dense fog. 

7. Always Use Dipped Headlights Together With Fog Lights 

Fog lights alone are not enough. Your dipped headlights help you see road markings and illuminate obstacles further ahead. Fog lights are an addition to your lighting, not a replacement for it. 

Additional Tips For Driving Safely In Foggy UK Conditions 

Although this blog focuses on fog light use, how you drive in fog is just as important. Our instructors consistently emphasise these habits in lessons because they make a genuine difference to your safety. 

1. Reduce Your Speed Gradually 

Sudden braking can cause chain reactions. Slow down smoothly and maintain a speed that matches the visibility. 

2. Increase Your Following Distance 

With limited visibility, you need more reaction time. Doubling the usual gap is an innovative practice. 

3. Stay In Your Lane And Use Road Markings 

Fog can distort your perception of distance. Road markings help guide you and keep you centred. 

4. Avoid Overtaking Unless Absolutely Necessary 

Fog can hide oncoming traffic. Stick to your lane and only overtake if you are 100 per cent certain the road ahead is clear. 

5. Listen for Traffic You Cannot See 

In thick fog, sound becomes a valuable tool. Turn off any distractions and stay aware of engine noise from nearby vehicles. 

6. Use Your Heater To Prevent Windscreen Fogging 

Internal fogging is just as dangerous as external fog. Use your heater and demister to keep the glass clear. 

Conclusion 

Understanding when to use fog lights in the UK is an integral part of becoming a safe, responsible driver. By following the Highway Code, using good judgment, and staying calm in poor visibility, you can significantly reduce the risks associated with foggy conditions. At Alfie’s Driving School, we help learners master real-world driving skills, not just what is on the test. Our instructors combine years of experience, DVSA knowledge, and a supportive teaching approach to help you feel confident in any weather. 

We proudly support learners across Romford, Dagenham, Barking, Hornchurch, Chigwell, Brentwood, Goodmayes, Loughton and surrounding areas, making it easy for you to learn locally with instructors you can trust.  

If you are ready to improve your driving skills or want personalised support for tricky conditions like fog, call us on 07957 458980 or email info@alfiesdrivingschool.com to book your lessons.