Tailgating..
Failing to signal a turn.
Stopping on the freeway entrance, rather than merging into traffic.
Weaving in an out of one’s lane, usually because they’re talking on the phone.
Out if the more rural area, where there are some 2 lane, undivided winding roads, people will pass you on blind curves, or when there is clearly another car coming from the other direction.
Not bothering to stop or even slow down at a stop sign. This happens often near my house.
Passing someone who’s going slower, but still going at least or over the speed limit, in the far right lane (not the fast lane or the passing lane) and then getting in front of them and slamming on their brakes.
Throwing lit cigarettes out of the window. We live in a high fire danger area.
Having their windows rolled down and playing loud (usually rap) music at full volume so that my car shakes.
Not letting other people merge into a freeway lane, even though the person trying to merge has nowhere else to go, except up the side of the embankment.
Not stopping for pedestrians that are already in the road.
Racing on the freeway.
Men on motorcycles standing up with no hands on the handlebars, or doing wheelies, on the freeway. I thought I’d seen everything until I started seeing men do this.
Going for a mile with the turn signal on, signalling that they want to go left, then suddenly, without warning, turn right.
Not stopping completely at red lights, before turning right, nor without bothering to notice that there are pedestrians in the road.
People who are signalling that they are planning to merge off of the freeway, while at the same time the person in front of them (but still in the on-ramp lane) is signalling that they want to get on the freeway, but instead of merging off behind them, they feel the need to speed up and pass the other person before they get off, making it almost impossible for the other person to merge onto the freeway safely, or at all.
People driving half a mile on the shoulder and then squeezing (merging) onto the freeway ahead of the other people who were already there, in the merging lane, sometimes causing an accident, but always slowing the line down even more.
People driving with loaded pickups and not having their stuff tied down properly, then seeing that stuff go flying.