Driving Gravel Roads in Iceland: Speed, Windscreen Protection and Technique

Gravel Roads Are Where Most Rental Car Damage Happens

Approximately 30% of Iceland's road network is unpaved. This includes significant stretches of numbered routes — not just remote farm tracks, but roads that your GPS will confidently route you along without any warning that the surface is about to change from smooth asphalt to loose volcanic gravel. The transition can be abrupt: one moment you are cruising at 90 km/h on smooth tarmac, and the next moment your tires are spraying stones and the steering feels entirely different.

Gravel road damage is the single largest category of rental car insurance claims in Iceland. Cracked windscreens from flying stones, paint damage from gravel spray, bent wheel rims from potholes, and rollover accidents from overcorrecting on loose surfaces — these account for more rental damage than all other causes combined.

Speed Is Everything — And Less Is More

The speed limit on gravel roads in Iceland is 80 km/h. But the safe speed on many gravel roads is significantly lower. Here is the breakdown:

• Well-maintained gravel (Route 54 Snæfellsnes, Route 612 Westfjords): 60-70 km/h is comfortable in dry conditions
• Rough gravel with washboard surface: 40-50 km/h to avoid losing control
• Loose gravel or sand: 30-40 km/h maximum — the car will slide
• Gravel roads with blind crests or sharp turns: 30 km/h or less — you cannot see oncoming traffic

The washboard effect (corrugation) is particularly treacherous. At certain speeds, the car bounces across the corrugations and the tires lose contact with the surface, reducing steering and braking to almost nothing. If you feel the car "floating" over the washboard, slow down immediately.

The Gravel-to-Paved Transition Zone

The most dangerous point on any Icelandic gravel road is the transition back to asphalt. After driving on gravel for 20-30 minutes, your reflexes and speed sense have adjusted. When the pavement suddenly returns, many drivers accelerate back to 90 km/h without realizing that their tires are still carrying a layer of gravel dust that dramatically reduces grip on smooth asphalt. Several serious accidents in Iceland have occurred at these transition points.

When you hit pavement after a gravel section, maintain your gravel speed for the first 500 metres while the tires clean themselves. Then accelerate gradually.

Protecting Your Windscreen

Windscreen damage from flying gravel is essentially inevitable if you drive enough gravel roads in Iceland. Oncoming vehicles kick up stones, and a single impact at relative closing speeds of 100+ km/h can crack a windscreen instantly. Strategies to reduce the risk:

• Slow down dramatically when meeting oncoming traffic. Drop to 30-40 km/h when you see a vehicle approaching. This reduces the impact energy of any stones it throws up.
• Move as far right as safely possible. More lateral distance from the oncoming vehicle means the stones lose energy before reaching you.
• Follow at a safe distance. If following another vehicle on a gravel road, leave at least 200 metres. Closer than this and you are driving in a constant shower of stones.
• Buy gravel protection insurance. At 1,000-2,500 ISK per day, it is the single best insurance add-on for Iceland. Without it, a cracked windscreen replacement is your full liability — typically 80,000-150,000 ISK for a standard car.

Navigating Blind Crests and Curves

Many gravel roads in Iceland have blind crests (hnjúkur) — rises in the road where you cannot see what is on the other side. On a two-lane paved road, this is manageable. On a narrow gravel road, it is genuinely dangerous because oncoming vehicles may be driving in the centre of the road (a common and sometimes necessary practice on narrow gravel roads).

Approach every blind crest on a gravel road at a speed that allows you to stop within the visible distance ahead. Sound your horn briefly as you approach the crest to warn any vehicle on the other side. Keep right. And expect the unexpected — livestock, cyclists, and parked cars appear on the other side of blind crests with alarming regularity.

Dust and Visibility

In dry conditions, a vehicle on a gravel road creates an enormous dust cloud that lingers for 10-30 seconds after the vehicle passes. This dust reduces visibility for following vehicles to near zero. If you are following another vehicle and they pull away, do not try to close the gap — you will be driving blind through their dust cloud. Wait for it to settle or increase your following distance to at least 300 metres.