EVERYTHING.
It's a curious thing, really. I love driving. I'm at my most content when I'm behind the wheel of my car, whether in cities or on the highway. I take pride in being a courteous, smart, skilled and defensive driver. I love driving.
And yet...
I hate everybody else on the road. The more cars there are around me, the less I enjoy driving. I'm constantly on the look-out for other drivers that could potentially be a problem. If a person doesn't slow down fast enough for a stop sign, or if they're wandering a bit within the lane, or even if they can't keep a constant speed - cruise control is a wondrous and useful thing, people! - I have a bad habit of keeping my eye on them.
On a completely unrelated note, personal experience has told me that I'm more likely to have issues with pickup truck drivers than anyone else. Unfortunately, around here, pickup trucks are everywhere, much to my dismay.
And, of course, because I keep my eye on those folks, I sometimes become only marginally aware of everything else around me. I'm aware that this is a really bad, potentially hazardous habit, and I'm trying to work on it, but sometimes certain factors come together that make me straight-up anxious.
Also, I know I come off as hypocritical, in more than one way. I say I'm content while driving, yet it sounds like I'm constantly nervous and about to lose my mind. I claim to be smart and skilled, then turn around and admit to almost tunnel-visioning to the point of being possibly the biggest hazard to everyone around me.
If I had to choose, though, I would think that cyclists are my biggest berserk button. The instant I see a cyclist pedaling their happy ass along the road in front of my right side - especially annoying when there's a perfectly good, empty sidewalk right next to them - I immediately go on the defensive. I don't know why, but it almost seems like cyclists are the least aware of their surroundings, and are convinced that they need about 3 feet around them more than what they really need. The wheels are, what, and inch and a half wide? Why do they feel like they need to be 4 feet out into the lane? MY lane? And again, there's a perfectly good sidewalk that's almost NEVER used! Now I have to either veer into the oncoming lane, a nervous move, even on a straight, clear road, or slow way the *&^% down because this jackass refuses to get out of the way of the half-ton of metal and I WILL RUN YOU THE *&^% DOWN IF-
...
*deep breath in*
......
*deep breath out*
...
Cyclists annoy me.