[throwawayacc3]

The Tesla had its turn signal on for a solid 5 seconds before impact. I blame the asshole that was in the far left lane going way too fast and not slowing down (just letting off the accelerator when the Tesla signalled would have prevented the accident) when someone is trying to enter. Then they brake way too late. Everyone behind that first vehicle is also to blame for following too closely at too fast of a speed and braking too late.

[rootusrootus]

Friend of mine was driving down the road one day, and someone in the lane next to him turned on her turn signal, then merged into him without looking. She explained the situation carefully to the adjuster, noting that "she had her turn signal on, therefore she had the right to merge." At this point, the adjuster contacted my friend and asked where to send the check.

A turn signal does not give you the right to the lane. You have to look, there has to be enough room.

[throwawayacc3]

There were multiple car lengths of room when the Tesla started merging. The other car was so far back it wasn't close to the blindspot. Americans do not adjust their speed or following distance to the conditions. They drive like they have some sort of right to a road free of obstructions and to drive at the speed limit or above, no matter the circumstances.

[rootusrootus]

Takes about 8 to 10 car lengths for an average car to stop from 60 mph, from the moment the brakes are activated fully. A fast human reaction time would be 150ms, but that's just to react, not to get the foot onto the brake. So add another 3 car lengths.

There were not 11-13 car lengths between the car in the left lane and the Tesla when it brake checked them.

Generalizing about Americans is tiresome, by the way. It makes you look petty and ignorant. Which might be true, but on the off chance you didn't intend to come across that way...