The fog is forecastable. The system just refuses to warn.
Each year, along Chile's major highways, a dense coastal fog known as camanchaca descends with quiet regularity — and with it, death. The phenomenon is not mysterious: meteorologists can forecast it, drivers fear it, and the roads where it strikes are well known. Yet between the predictability of nature and the protection of human life, a gap persists — one filled not by institutions, but by truck drivers warning each other through WhatsApp messages in the dark.
- A chain of eighteen vehicles collided on Route 5 South in October 2020, killing two people, after fog reduced visibility to barely twenty meters and turned the pavement slick with moisture and engine heat.
- The 2011 Route 68 disaster — Chile's largest multi-vehicle accident — killed five people including an eleven-year-old child and injured forty-two, yet courts ruled the fog itself was to blame, freeing the highway concessionaire from any legal responsibility.
- Meteorologist Iván Torres warns that the conditions producing camanchaca are forecastable and follow identifiable patterns, but highway operators have never invested in trained personnel capable of issuing real-time alerts to drivers.
- Professional truckers like thirty-year veteran Mateo Castro have built informal WhatsApp networks to share fog warnings across routes spanning nearly seventeen hundred miles — a grassroots safety system born from institutional failure.
- With Chilean highway accidents rising eight percent between 2018 and 2019 and over sixteen hundred deaths recorded in 2019 alone, the absence of predictive alert systems represents not a gap in knowledge, but a gap in political and corporate will.
On a Friday morning in October, eighteen vehicles collided in rapid succession on Route 5 South, one of Chile's busiest highways. Two people died. Alejandra, who was in one of the cars, remembers almost nothing — the road simply vanished. Visibility had dropped to perhaps twenty meters, and the pavement had turned slick from the mixture of engine heat, moisture, and suspended dust that dense fog leaves behind.
This is the recurring nightmare of Chilean highways. The phenomenon — known locally as neblina or camanchaca — is not rare, and it is not unpredictable. Meteorologist Iván Torres is direct about what science makes possible: fog of this kind follows patterns of temperature, wind, and time of day that can be forecast with reasonable accuracy. Danger zones are already marked with signage. What is missing, Torres says, is the institutional will to hire trained personnel who could issue real-time warnings when fog is imminent and guide traffic accordingly.
Mateo Castro has driven trucks across Chile for thirty years, hauling lumber from the south to the far north — a crossing he makes at least twelve times a year. Of all the hazards he has faced, dense fog frightens him most. He and other professional drivers have built their own informal safety network through WhatsApp groups, alerting one another to impassable stretches of highway. It is a practical solution born from necessity, not from any system designed to protect them.
The starkest example of what camanchaca can do remains the 2011 disaster on Route 68, connecting Santiago to Valparaíso. More than fifty vehicles collided in sequence as fog erased the road. Five people died, including three members of one family and an eleven-year-old child; forty-two others were injured. When the families of the dead sued the highway concessionaire over inadequate signage, the court ruled that the fog itself — an act of nature — was the cause, and absolved the company of liability.
The ruling captured something larger than one legal case. Chile recorded nearly ninety thousand traffic accidents in 2019, killing over sixteen hundred people. Fog accounts for an unspecified but recurring share of those deaths. The knowledge to reduce them exists. The will, so far, does not.
On a Friday morning in October, eighteen vehicles collided in rapid succession on Route 5 South, one of Chile's busiest highways. Two people died. Alejandra was in one of the cars. She remembers almost nothing—the road ahead simply vanished. "You couldn't see anything, maybe twenty meters at most," she said later. "We were going slowly, which is why we didn't hit the car ahead head-on. But the road felt like soap under our tires."
This is the recurring nightmare of Chilean highways: a phenomenon locals call neblina or camanchaca, a dense fog so thick it erases the world beyond arm's length. It is not a rare weather event. It is predictable. Meteorologists can forecast it. Yet it keeps killing people, and the system designed to protect drivers has largely failed to adapt.
The fog itself is only part of the problem. When it rolls across the highways, the heat from vehicle engines mixes with moisture and suspended dust, creating a slick residue on the pavement. Brakes fail. Visibility drops to nothing. Drivers cannot see the vehicle ahead until they are already colliding with it. On Route 5 that October day at kilometer 607 from Santiago, the pile-up left burned-out shells and survivors who knew they had been lucky.
Iván Torres is a meteorologist who studies these conditions. He is blunt about what could be done: fog is forecastable, sometimes very accurately. The conditions that produce it—specific combinations of temperature, wind, and time of day—follow patterns. Signage already marks the zones where fog appears frequently. But Torres says the highway concessionaires have never invested in trained personnel to issue real-time warnings when fog is imminent. "If there was the will to hire expert staff to monitor these conditions, you could generate better traffic flow in affected zones," he explained. "Not a formal restriction, but warnings and better care to prevent these accidents."
Mateo Castro is fifty-three and has spent thirty years driving a truck across Chile, hauling lumber from the south to Alto Hospicio in the Tarapacá region, nearly seventeen hundred miles from the capital. He makes the crossing at least twelve times a year. Of all the dangers on the road—robbery, violence, mechanical failure—the dense fog terrifies him most. "I would rather lose a few hours than face that deadly fog," he said. Professional drivers like Castro have built their own safety system. They communicate through WhatsApp groups, warning each other about impassable sections of highway. They know the routes by memory, the curves and the trouble spots. But even that knowledge offers only partial protection. "Sometimes you can see the reflective lights and use them to navigate," Castro said. "But other times, even the best driver in the world wouldn't know what's ahead."
The most catastrophic example remains the 2011 disaster on Route 68, which connects Santiago to the coastal cities of Valparaíso and Viña del Mar. On October 12 that year, dense fog descended on the highway. More than fifty vehicles—seventeen cars, twenty-three trucks, and eleven buses—collided at high speed, one after another, in what became the largest multi-vehicle accident in Chilean history. Five people died, including three members of one family and an eleven-year-old child. Forty-two others were injured. The National Emergency Office documented the wreckage methodically. The fog had simply erased visibility.
The families of the dead sued the highway concessionaire, arguing that inadequate signage had contributed to the disaster. After years of investigation, the court ruled that the fog itself was the cause—an act of nature—and exempted the company from liability. The judicial decision stated plainly that the accident "was produced by the existence of dense fog," as if weather absolves infrastructure of responsibility.
Chile's traffic accident statistics are grim. Between 2018 and 2019, crashes increased by roughly eight percent. In 2019 alone, there were nearly ninety thousand accidents, killing sixteen hundred seventeen people. An unspecified portion of those deaths involved fog. The phenomenon is not rare. It is not unpredictable. Yet it remains, year after year, a killer on the highways.
Citações Notáveis
You couldn't see anything, maybe twenty meters at most. The road felt like soap under our tires.— Alejandra, survivor of October 2020 Route 5 pile-up
If there was the will to hire expert staff to monitor these conditions, you could generate better traffic flow in affected zones.— Iván Torres, meteorologist
I would rather lose a few hours than face that deadly fog.— Mateo Castro, truck driver with 30 years on Chilean highways
A Conversa do Hearth Outra perspectiva sobre a história
Why hasn't the government or the highway companies simply installed better warning systems if meteorologists say the fog is forecastable?
That's the question that keeps coming up. The technology exists. The science exists. But there's no political will or financial incentive. The concessionaires say it's a weather problem, not an infrastructure problem. The courts have agreed with them.
So the 2011 court ruling essentially gave them permission to do nothing?
In a way, yes. Once the judge said the fog was the cause, not the lack of warnings, the company had no legal obligation to improve. The families lost their case. That decision rippled through the system.
But drivers like Mateo Castro have figured out their own warning system through WhatsApp. Doesn't that prove the demand is there?
Absolutely. Professional drivers are doing the work the highway system should be doing. They're sharing real-time intelligence because their lives depend on it. It's informal, it's fragile, and it only reaches people in those groups.
What would actually change this?
Either a major accident that forces political pressure, or a concessionaire deciding that installing monitoring stations and hiring meteorologists is cheaper than the liability and bad publicity from repeated crashes. Right now, neither has happened.
And in the meantime, people keep dying on routes where the danger is completely predictable?
Yes. That's the frustration. Everyone involved—the meteorologists, the drivers, the families—knows exactly what the problem is and how to solve it. But the system hasn't moved.