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Just off the top of my head...
That rat bastard Phil lol.
When driving, it annoys me when the first guy in line who has the left turn green arrow takes their sweet old time, when 5 more cars could have made it through the intersection. Then there's the 2nd guy.
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People who don't use their signal lights.....
lol! A LOT of people who think they can drive...
People who use their cell phones (mainly look at them for various reasons) while driving - facebook, texting, etc... (= unsafe)
People who say it doesn't mess up their driving... (the ones who lane weave, and travel at erratic speeds = unsafe)
People who say they only do it traffic lights... (the ones who are still there when it is green, and don't even know it - and continue to say it doesn't mess them up = unsafe).
People who do not flow freely at free-flowing right turns (something we have a few of in my city - they stop, even though there is no stop or yield sign = unsafe)
People who stop when they have the right of way, blocking the intersection, eventually stopping traffic for everyone else (= unsafe).
People who think it should EVERYONE an hour to reach a cruising speed of 35mph, because EVERYONE should be driving a Prius, and never burn than an ounce of fuel per day (=discourteous).
People who brake BEFORE getting in the turn lane, slowing traffic unnecessarily
People who change lanes without signaling (then crossing 3-4-5 lanes of traffic, thinking that it should be okay, instead of exiting safely, and performing a legal U-turn at some point = unsafe).
People who park in the back of the lot, and take up 2-4 spots, in their average sports car, because they think it's special, even though the parking lot is filling up, disregarding everyone else's personal space/property (=discourteous).
People who don't know how to park correctly (understandable for people who can't see, or color within lines - but they should still be in kindergarten, and shouldn't be driving = unsafe).
People who don't know what the passing lane is there for (= discourteous).
People who travel at a faster speed to pass a car, then slow down for seemingly no apparent reason, just to be passed by that same car who appeared to be traveling at a constant speed, which sometimes leads the first car to speed up for some reason.
People who don't know how to turn, or brake at normal speeds (slow to 5mph or slower for each turn, or brake 1 mile in advance, because they don't understand/care how brake pads work - ignorant=unsafe)
People who travel 25mph in a 45mph zone (because they are blind and/or unable to observe traffic signs, or control their vehicle - either way, they are unsafe, and a danger to everyone on/near the public roads).
People who speed in school zones (because after the first sign, they speed up, as if children know the difference - unsafe).
People who don't like being passed, then speed up after they were passed (if they wanted to travel that fast in the first place, they wouldn't have been passed to begin with - they just have inferiority issues). Because now a person that is not normally driving at speed has sped up, and they may not understand the characteristics of their vehicle at this new speed (either unsafe or discourteous).
Basically - those who are, for whatever reason, ignorant, unsafe or discourteous drivers. There are a LOT of ways to be unsafe and discourteous. Everyone makes mistakes, but when you're driving a 3-5 thousand pound missile, able to end one's life (or their family's life), the room for error is only a few feet (or maybe a second or two).
MANY people should not be able to drive, simply because they think it is a right to transportation, and have absolutely no clue what the effect of their driving has on others (whether sober, or impaired).
My list is actually a lot longer, but it always comes down to safety and courtesy. Treat every driver as if they are carrying a weapon. Ah, the good ol' days.