A newsletter from the Madison B-Cycle folks pointed out that the biking laws in Wisconsin have been revised somewhat, in interesting ways (at least to me).
You can now stick your arm out to the right to signal a right turn. (I didn’t realize that this was wrong.)
Studded bike tires (important for riding on snow and ice) are now legal. (I didn’t realize that they weren’t. I wish I’d had them when I crashed and broke my elbow back in 2008; now I don’t need them as I’m not risking riding on snow in any case.)
You can have a rear light in place of a rear reflector. (Again, I didn’t realize that this would be wrong.)