I live in Southern California, and there's much that I love about living here, but the one thing I don't love is the bad drivers. I've lived all over the country, and I really do think that SoCal drivers rank among the worst. I see the following driving etiquette violations on a daily basis:
1) Tailgating. Drivers here have it perfected to a fine science. Personally, I don't know how they do it -- I work hard to keep an exact, safe distance between myself and the car in front of me (a looong distance in front of me). People who ride up other car's butts (especially my own) scare the heck out of me.
2) Related to the above is tailgating at night, by SUVs. This really, really annoys the heck out of me. If you're an SUV, please don't ride my butt at night, and flood the interior of my car with your headlights. It's blinding!!! I confess to slowing down, just to annoy them so they'll go around me.
3) Lack of turn signal usage. 'Nuff said. Nobody uses them out here. Well, except for me.
4) People who drive on the shoulder in traffic jams. This makes me so angry. What makes you so special that you get to a) break the law, and b) pass the rest of us law-abiding citizens by driving on the shoulder? This happens in every traffic jam on the freeway, all those self-entitled jerks, zipping along on the shoulder...
Anyone got any others that drive you insane?