Top causes of car accidents — and how to avoid them

We review real collisions across four states every day. The striking thing is not the variety — it is how few distinct stories there are. The same handful of mistakes produce most of what we see, and all of them are avoidable.

1. Distraction

Not just phones, though phones are the worst of it. At 45 mph you cover roughly 66 feet per second; two seconds glancing down is more than half a football field traveled by a driver who is not looking. In our footage, distraction usually shows up as an absence — no brake lights at all before the impact. The driver never saw it coming, which means they never reacted.

2. Following too closely

Rear-end collisions are the most common thing we capture, and they are almost purely a function of following distance. The three-second rule — pick a fixed object, count from when the car ahead passes it — is the simplest fix in driving. Double it in rain, more in ice or fog.

3. Left turns across traffic

Unprotected left turns are structurally dangerous: you are judging the speed of an oncoming vehicle, from an angle, often with a queue building behind you creating pressure to go. Misjudge it and you take the impact in the side, where cars protect you least.

If there is a protected arrow, wait for it. If there is not, wait for a gap that feels excessive — the pressure to move is a feeling, not a fact.

4. Running the light

Almost nobody runs a red on purpose. What happens is a decision made at speed as the light turns yellow, based on a distance estimate that is wrong. The result is the most violent crash type at an intersection, because a T-bone hits the passenger compartment directly.

Our signal analysis puts a number on it. When we say a vehicle entered 1.4 seconds after the light went red, that is not an opinion, and it is very hard to argue with.

5. Speeding

Speed rarely causes the crash by itself. What it does is convert an avoidable situation into an unavoidable one: it stretches stopping distance far more than the speed increase suggests, and shrinks the time to react. The same event at 35 mph is a near miss; at 50 it is a collision, and a far worse one.

6. Impairment and fatigue

Impaired driving is the obvious one. Fatigue gets less attention and looks nearly identical in footage — delayed reaction, drifting within the lane, no evasive action. Being awake for 18 hours impairs performance comparably to a blood alcohol level around the legal limit.

What actually reduces your risk

• Phone out of reach, not just face-down. If you can grab it, you will.
• Three seconds of following distance minimum, doubled in bad weather.
• Never take an unprotected left on a gap you have to hurry for.
• Treat a fresh yellow as a stop unless stopping is genuinely unsafe.
• Leave earlier. Almost every risky decision on the road traces back to being late.
• At a green light, look left before you go. That is where a red-light runner comes from.