[pas]

No, it's more complicated than that. If someone cuts in front of you and you end up rear-ending them, it's not your fault. See all the fucking break-check idiots. (And the videos when someone does it to a car, which then turns out to be a cop.)

That said, yes, in theory you have to be alert, as the car in front of you can at any moment do something unexpected. (Eg. the driver falls asleep and crashes into the barrier.)

[enko123]

There's also an insurance scam where the driver slams on the brakes for no reason on the highway hoping you rear-end them literally was 50mph to 0. I barely dodged that one, since I allow 3-lanes of stopping distance, but I still needed to swerve toward the median, and the guy behind me hit me, and behind him hit him and behind him hit him.