FSD Avoided a Head-On Crash on a New Mexico Highway — A Real Story of Inches and Milliseconds

Late last year, one night, there was almost no traffic on Highway 54 in New Mexico. Clifford Lee was driving his Cybertruck from Austin, heading north, with FSD engaged, cruising at 75 mph.

That highway is a two-lane road with no median barrier. Cars from the opposite direction would zoom by every now and then. Not far ahead, a big semi truck was heading south, followed by a pickup that looked like it was in a hurry to pass.

Lee later told a CBS Austin reporter that he was watching the oncoming headlights. "About five seconds ahead I saw that pickup passing in the opposite lane, but it wasn't until around the third second that I realized — there's no way it's getting back in time."

That one or two second delay in judgment really shows the biggest problem humans have in emergency situations. Normally, from noticing the danger to making a decision and actually taking action, it takes about 1.5 seconds for most people — some even longer. Lee noticed something off five seconds early, but didn't confirm the danger right in front of him until three seconds in. That confirmation process is exactly the weak spot of human driving: our brains need time to go from sensing, to recognizing, to deciding. No match for a purely mechanical sensor that reacts instantly.

Right when Lee realized he had to do something fast, he found his hands couldn't grip the steering wheel steadily anymore. "I tried to yank the wheel, but the car was already moving. Honestly, I don't remember what I did or when I did it."

FSD didn't wait for him.

Frame by Frame — What FSD Did in Milliseconds

Looking at the onboard footage frame by frame after slowing it down, the Cybertruck squeezed into an extremely tight gap — hugging the highway guardrail, almost scraping the oncoming pickup. Both media reports said the pickup's side mirror clipped the Cybertruck, but a full collision was completely avoided.

Lee later shook his head and said: "It was just inches."

What's interesting is that Lee didn't rely on FSD from the start. Talking about that experience, he said: "If I had been on my own, I'd probably be in the hospital right now, or worse. I was trying to turn, but the car had already started adjusting before I could even fully process what was happening."

That's the biggest difference between FSD and humans. FSD's pure vision system uses multiple high-res cameras around the car to build a 360-degree environmental perception network, roughly processing 30+ frames per second in real time, identifying lane lines, obstacles, and the movement of nearby vehicles. According to data Tesla has shared, vehicles using FSD (with driver supervision) average about one major crash every 5 million miles driven in North America, while the national average for human drivers is about one every 660,000 miles. In other words, looking at the numbers, FSD is roughly seven times better at preventing serious accidents.

After that incident, when Lee spoke to CBS, he said something that really stuck. "That was my second life right there." He kept repeating it, slowly. "A head-on collision at a combined speed of almost 150 miles per hour — there's no way you survive that."

The Limits of FSD — And Where It Excels

But let's be real. FSD's accuracy depends heavily on clear visual conditions — how clean the lane markings are, how the weather is, how bright it is — all of it directly affects its judgment. The problem of that stretch of Highway 54 having no median barrier, some people online joke it's "the charm of American highways," but precisely because the situation was relatively simple — few cars at night, lane lines visible — FSD could really show what it's capable of.

And FSD is still a Level 2 driver-assist system. The driver has to stay alert and be ready to take over at any moment.

But this near-miss made one thing very clear: when the reaction window shrinks to within one second — life or death — FSD and a human driver operate on completely different levels. A human's strength is big-picture judgment and complex decision-making. For an emergency evasive maneuver, you have to recognize, decide, then act — and no matter how well you train, you can't avoid a physiological delay of over one second. FSD's advantage is processing speed: it can evaluate a dozen different collision avoidance options within 100 milliseconds and execute the best one instantly.

When you're going 75 mph, every second means the car travels 34 meters forward. If you rely on a human's 1.5 second reaction time, the car would have coasted over 50 meters — it would've crashed for sure.

Could a Human Have Pulled This Off?

Honestly, while writing this I kept thinking to myself: if a driver as experienced as Lee had been behind the wheel that day without FSD, could they have gotten out of it safely? Hard to say. A rational guess would be around fifty-fifty — because at 75 mph in such a tight space, a human's reflex speed probably just isn't fast enough.

Lee himself admitted: "I had barely started reacting, and the car had already completed the maneuver."

So if you really want to compare FSD and a human in an extreme situation like this — in terms of pure millisecond-level reaction speed, FSD is definitely sharper. Its reaction and execution speed are way beyond a human's. But when it comes to recognizing complex situations and making the final call, a human's experience and big-picture awareness are still something FSD can't fully replace — at least for now.

Still, I bet that pickup driver has no idea to this day that on that pitch-black New Mexico highway, the Cybertruck they almost slammed into — ended up being saved by FSD, by just inches.

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*This article is based on reporting by CBS Austin. Clifford Lee's Cybertruck onboard footage was reviewed frame by frame to reconstruct the incident. Tesla FSD safety statistics are sourced from Tesla's quarterly Vehicle Safety Reports.*