The challenge of night driving is that you spot hazards later, so you need to drive within the range of your headlights and rely on good tyres to stop in time. Lights, visibility and grip all work together after dark. Healthy tyres are the safety net for the moment a hazard appears later than it would in daylight.
Drive within your lights
On an unlit road, never drive faster than you can stop within the distance your headlights light up. This is the Highway Code's core rule on speed (rule 126): drive at a speed that will allow you to stop well within the distance you can see to be clear. Dipped beams reach roughly 50 metres, so your safe speed must let you stop within that on a dark road. It's easy to overdrive your lights without realising, which leaves no margin if something is in the road ahead.
See and be seen
Keep your headlights and windscreen clean inside and out, and make sure your lights are aimed correctly, dirty or misaimed lights cut your vision sharply. Use full beam on empty roads but dip promptly for oncoming traffic and when following another car. The Highway Code (rule 115) says to slow down, and if necessary stop, if you are dazzled by oncoming headlights; look to the left-hand verge to keep your line.
Why tyres matter more at night
Because you see hazards later at night, the distance you need to stop is even more dependent on grip. Worn tyres that brake poorly, especially in the wet, see wet-weather safety, leave you no margin when a hazard appears at the edge of your headlights. Good tread (the legal minimum is 1.6mm across the central three-quarters and around the whole circumference, see UK tread depth law) and correct pressures are what turn a late-spotted hazard into a safe stop.
Tiredness and breakdowns
Night driving brings tiredness, so take breaks and don't push on when drowsy. And if you do break down in the dark, being seen matters more than ever: hazards on, sidelights on, and follow breakdown safety. A mobile tyre fitter can come out to you if a tyre fails at night, as long as the car is somewhere safe off the carriageway.
Stopping distances and what your lights show
At 60mph the Highway Code's typical stopping distance is 73 metres in the dry, which is further than dipped headlights let you see on an unlit road. That is the whole night-driving problem in one line. The figures below are from rule 126, and they assume a dry road, good tyres and an alert driver.
| Speed | Thinking distance | Braking distance | Typical stopping distance |
|---|---|---|---|
| 30mph | 9m | 14m | 23m |
| 40mph | 12m | 24m | 36m |
| 50mph | 15m | 38m | 53m |
| 60mph | 18m | 55m | 73m |
| 70mph | 21m | 75m | 96m |
The braking part is where tyres come in. Those figures assume tread that clears water and rubber that grips, and the Highway Code says stopping distances are at least double in the wet.
On a dark, wet B-road with tyres near the legal limit, the distance you need to stop and the distance you can see to be clear can cross over without you noticing.
Dipped beam lights the road for roughly 50 metres, and less on the offside so you do not dazzle oncoming drivers. On an unlit road with no other traffic, use full beam and you gain a great deal more warning.
The hazards that are worse after dark
Potholes, debris and standing water are all harder to see at night, and every one of them is a tyre hazard. In daylight you steer round a pothole without thinking; at night you find it with the front wheel, and a hard hit on an under-inflated tyre is the classic cause of a sidewall bulge that appears a week later.
- Potholes and sunken drain covers: worst on unlit rural roads and after wet weather. Keep pressures correct, because a properly inflated tyre resists an impact far better than a soft one.
- Debris on the carriageway: tyre carcass, timber, dropped loads. On a motorway at night you often see it only when the car in front swerves. Leave more space so you have time to react.
- Standing water: a flooded dip looks like dry tarmac in headlights. Slow right down where water collects, and never drive into water you cannot judge the depth of.
- Black ice: on a cold clear night, bridges, shaded lanes and exposed country roads freeze first. Stopping distances on ice can be ten times those on a dry road.
- Animals: deer are most active at dawn and dusk. Where a deer sign appears, expect them, especially in autumn.
Tyres cannot see for you, but good tread and correct pressure give you a margin when you meet something late. If you hit a pothole hard, check the tyre and wheel at the next safe stop rather than assuming it survived. If it did not, photograph the pothole and note where and when it happened.
Lights you must use, and when
Between sunset and sunrise you must have sidelights and the number plate light on, and headlights on any road without street lighting or where the limit is above 30mph. That is Highway Code rule 113, and it is the minimum rather than the ideal.
Most drivers are better off with dipped headlights whenever the light is poor, and many modern cars do this automatically.
Rule 114 adds the two things people get wrong: you must not use lights in a way that dazzles other road users, and you must not use front or rear fog lights unless visibility is seriously reduced. Rear fog lights on a clear night hide your brake lights and blind the driver behind.
A few practical points make a big difference:
- Check both headlights, both tail lights and the brake lights work before a night journey. A car with one headlight looks like a motorbike to an oncoming driver.
- Clean the lenses. Road film on a headlight cuts its output, and it builds up fastest in winter.
- If the car is heavily loaded, the nose lifts and the beams point higher. Use the headlight leveller if your car has one.
- Dip early for oncoming traffic and when you catch up with a car ahead, so you do not dazzle them in their mirrors.
Breaking down at night
If a tyre fails after dark, being seen comes before being fixed. Get the car as far off the road as you safely can, put the hazard lights on, and leave the sidelights on so the car is lit from behind. Get everyone out on the side away from traffic and, on a motorway, behind the barrier.
On an ordinary road the Highway Code allows a warning triangle at least 45 metres behind the car on the same side of the road, but never on a motorway, where you should not walk back along the carriageway at all.
A high-visibility jacket kept in the cabin, not the boot, makes you visible in the time it takes to put it on. See what to keep in a car tyre emergency kit.
Changing a wheel on a dark verge is more dangerous than doing it in daylight, because drivers see you later and the ground is harder to judge. Unless you are well off the road with good light and firm ground, the better option is a phone call.
An out-of-hours mobile tyre fitter can replace the tyre where the car stands, provided it is somewhere safe and off the carriageway, never on a motorway hard shoulder or verge. Stay in the light, behind the barrier where there is one, until they arrive.
Keep your tyres ready
We can check and replace your tyres at your home or work from our base at Brent Cross, NW2, including evenings and nights when the diary allows, at the same price as a weekday job. London and the Home Counties are closest; further out, we tell you on the call whether we can take the job.
