Driving in Fog, Rain and Snow in Spain

Driving in bad weather in Spain comes down to three habits: switch on the right lights, slow down enough to stop within the distance you can see, and leave more space in front. In fog, heavy rain and snow you must use dipped headlights, you can add the front fog light, and you should only turn on the rear fog light when visibility is seriously reduced. Never use main beam in fog. This guide walks through the lights, the speed, the distance, snow chains, and the new motorway snow rule coming on 1 October 2026.

In the DGT syllabus this belongs to the chapter on Visibility and Road Hazards, which explains the rule alongside the exam questions that test it.

Which lights should you use in bad weather?

Use dipped headlights (luz de cruce) whenever visibility is poor: fog, heavy rain, snow, dust or smoke. Dipped headlights let others see you and light the road without dazzling anyone. They are the baseline in almost every bad-weather situation, day or night.

On top of dipped headlights, you may switch on the front fog light in fog, heavy rain or snow. It throws a low, wide beam that cuts under the murk. The rear fog light is different: it is very bright and dazzles drivers behind you, so only use it when visibility is seriously reduced, and switch it off as soon as conditions improve.

What you must never do is use main beam (full beam) in fog. The light bounces straight back off the water droplets and blinds you. For the full picture on when each light is legal, see our guide to headlight rules in Spain.

How much should you slow down and how far should you stay back?

The core rule is simple: reduce your speed so you can always stop within the distance you can actually see. If fog cuts your visibility to 50 metres, you must be able to stop inside those 50 metres. The posted limit is a maximum for good conditions, not a target for bad ones.

You should also give yourself more room in front. In fog and on wet roads, double your normal safety distance. A gap that is safe in the dry is not enough when the road is slick and you cannot see far ahead.

A quick way to judge the gap is the time method: pick a fixed point, and count the seconds between the car ahead passing it and you reaching it. Aim for a bigger gap than usual in the wet. We explain the method in detail in our guide to safe following distance in Spain.

How do you drive safely in fog?

Fog is the condition that catches drivers out most, because speed feels slower than it is and hazards appear with no warning. Slow right down, use dipped headlights and the front fog light, and keep the rear fog light for when visibility is genuinely poor. Turn it off again once the fog thins.

Fog lights, step by step

• Dipped headlights: always on in fog, day or night.
• Front fog light: allowed in fog, heavy rain or snow. It helps you see the road edge.
• Rear fog light: only when visibility is seriously reduced. Switch it off the moment the fog lifts, or you will dazzle the car behind.
• Main beam: never in fog. It reflects back and makes things worse.

Following the car ahead in fog

Do not use the tail lights of the car in front as a guide to hug close. That is how chain collisions start. Keep well back, brake gently and early, and use the painted line on your side of the road as a reference if the fog is thick.

What about rain and aquaplaning?

Rain is dangerous because it builds up on the road and reduces grip long before it feels risky. Switch on dipped headlights, cut your speed, and double your following distance to at least three seconds. Wet tyres need more time and more distance to stop.

The specific hazard in heavy rain is aquaplaning: a film of water lifts the tyres off the surface and you lose steering and braking. If it happens, do not brake hard and do not turn sharply. Ease off the accelerator, hold the wheel steady, and let the car slow until the tyres grip again.

Good tyres matter here. Worn tread cannot clear water, so aquaplaning starts at lower speeds. The best defence is simple: slow down when it rains, and slow down more when it rains after a dry spell, because the road is at its most slippery then.

What are the rules for snow and ice?

When there is snow or ice, you should carry snow chains in the car so you can fit them when the road demands it or when signs or authorities require it. Fit them to the driven wheels, following the maker's instructions, before you reach the worst of the snow rather than in the middle of it.

Once you are running on chains or special winter tyres, your maximum speed is 30 km/h. That limit protects the chains and keeps the car controllable on a low-grip surface. Do not exceed it, even where the road would normally allow more.

Beyond the legal points, drive as smoothly as you can on snow and ice. Gentle inputs on the throttle, brake and steering keep the tyres gripping. Sudden movements are what break traction and put you into a skid.

What is the new motorway snow rule from 1 October 2026?

From 1 October 2026, a new rule (RD 518/2026) changes how you drive on a motorway (autopista or autovia) during snowfall. When it is snowing, drivers will not be allowed to overtake, and everyone must keep to the right and leave the left lane or lanes clear for snow-clearing vehicles to pass.

The idea is to give the ploughs and gritters a free run so they can clear the road quickly and keep traffic moving. Until then the general bad-weather rules above apply. Once the rule is in force, expect it to be signed and enforced during snow events, so plan to stay right and hold your lane.

This sits alongside other changes arriving on the same date, including new rules on overtaking cyclists and opening an emergency corridor in stopped traffic. If you are studying the theory in 2026, it is worth knowing which rules are already in force and which start on 1 October. Our DGT theory test in English guide keeps track of the current syllabus.

Frequently asked questions

When can I use the rear fog light in Spain?

Only when visibility is seriously reduced by dense fog, heavy rain or snow, or thick smoke. It is very bright and dazzles drivers behind you, so switch it off as soon as conditions improve.

Can I use main beam in fog?

No. Main beam reflects off the water droplets in fog and dazzles you, making things worse. Use dipped headlights and, if you want, the front fog light instead.

How fast can I drive with snow chains fitted?

With snow chains or special winter tyres fitted, your maximum speed is 30 km/h. The limit protects the chains and keeps the car controllable on snow and ice.

How much following distance do I need in the rain?

Double your normal gap. On wet roads and in fog, leave at least a three-second gap to the car ahead, because wet tyres need more distance to stop safely.

What is the new motorway snow rule?

From 1 October 2026, under Real Decreto 518/2026, during snowfall on a motorway you cannot overtake and must keep right, leaving the left lane or lanes free for snow-clearing vehicles. It is an upcoming rule, not yet in force.

Sources

• Reglamento General de Circulacion (Real Decreto 1428/2003).
• Real Decreto 518/2026, en vigor desde el 1 de octubre de 2026: BOE-A-2026-13889.

Last updated: August 2026.