As we mentioned in our previous article, Spain’s traffic authority has just released its latest magazine – and one section in particular stands out for all the wrong reasons. It focuses on a type of crash many drivers rarely think about, yet it’s one of the deadliest on Spanish roads.
According to the latest data highlighted by the DGT, 482 people were killed in 2025 in these incidents alone – more than in all collisions combined. And what makes them even more concerning is how they happen: often suddenly, silently, and without warning.
The crash that happens when no one else is around
These are known as run-off-road crashes – when a vehicle leaves the road, often without involving any other car.
In fact, in nine out of ten cases, there is only one vehicle involved.
The DGT illustrates this with a real-life scenario. A nurse driving home after a night shift manages to stay alert for a couple of hours before fatigue takes over. At around 60 km/h, her car drifts off a secondary road. She wakes up just in time, brakes, and the vehicle stops in a field. No injuries.
But the outcome could easily have been very different. In another case mentioned, a car travelling at just 30 km/h left a poorly signposted road and fell into a canal. All six occupants died.
That’s what makes these crashes so dangerous – they don’t always involve high speeds, but they escalate fast.
Why these crashes are so deadly in Spain
The figures shared in the DGT publication are striking.
Run-off-road crashes account for around 40 per cent of all road deaths on interurban roads in Spain. Most of them happen on conventional roads, often in curves, and more frequently during the day – although the risk increases significantly at night.
The early hours of the morning, especially between 2am and 5am, are particularly dangerous. Fatigue, reduced visibility and lack of lighting all play a role.
Weather conditions and road design also matter. Uneven surfaces, poor signage, or changes in elevation can make it much harder to regain control once something goes wrong.
What causes drivers to lose control
So what actually leads to these crashes?
According to the DGT, distraction and excessive speed are the two main factors, present in three out of four fatal cases.
Alcohol is another key element. Around four in ten drivers involved in fatal run-off-road accidents test positive.
But there’s also a less obvious explanation.
Researchers suggest that in some cases, drivers may briefly lose consciousness due to fatigue or health-related issues. That could explain why many of these incidents show no signs of corrective action – no braking, no attempt to steer back onto the road.
When the environment makes everything worse
Experts also stress that what happens after the vehicle leaves the road is often what determines the severity of the crash.
If there’s a ditch, a slope, or a fixed obstacle, the impact becomes far more serious. Rollovers are also common in these situations.
And one detail makes a critical difference: wearing a seatbelt. In rollover crashes, it helps keep occupants inside the vehicle instead of being thrown out.
Straight roads vs curves: two different risks
The DGT analysis also highlights a key difference depending on the type of road.
On straight sections, these crashes are more often linked to distraction or falling asleep at the wheel. The road feels easy, attention drops – and that’s when the vehicle drifts off.
On curves, the main issue is speed. Entering too fast reduces the margin for error, and once control is lost, recovery becomes difficult.
What drivers in Spain should take from this
If there’s one takeaway from the DGT’s latest magazine, it’s this: these crashes don’t start with something dramatic. They often begin with a small lapse – a moment of fatigue, a brief distraction, a slight misjudgement.
But once the car leaves the road, the situation can spiral quickly.
Whether you live in Spain or are just driving here, the advice is simple: stay alert, take breaks when needed, slow down before curves, and avoid anything that takes your attention away from the road.
Because as these figures show, some of the most dangerous accidents are the ones drivers never see coming.