the ones i steer clear of are:

1. cars with tinted windows. if i can't see where the drivers looking, how am i supposed to know what they're doing? turn signals are rarely any help.

2. cops. this has been mentioned before, but there's a police station four or five blocks from my house and my experience is that our "finest" like to speed, cut lanes and run reds. who's going to ticket them, after all? and if you ever get hit by one of them while they're driving badly you can guarantee you'll be the one getting the ticket for it.

3. horses. this probably isn't an issue in your municipality, but here july seems to be ride-your-horse-on-the-street month. they have a mind of their own and always seem to be piloted by some oil executive pretending to be a cowboy who has approximately zero horse-handling skills. most notable incident was nearly being trampled by a runaway minature chuckwagon being pulled by shetland ponies in 2008. ugh.

the worst, of course, are cops on horseback with reflective sunglasses.