There are some situations in which bicyclists are better off acting differently than the law would suggest. An example: Say I’m riding outbound on Elston, and the light at Armitage is red. I know that once that light turns green, all the cars will race each other the very short distance to Ashland, and will weave back and forth with some significant number of them making a right turn from the left lane. They do this wherever I happen to be, and they’ll usually turn right in front of me or, if I’m not careful, through me. I’ve found, though, that if I run the light at Armitage (which is easy to do safely), I’ll be at Ashland out of the danger zone before the cars get the green and start their fighting. It’s safer for me to run the light.

Now, I’m not saying it’s always safer to act this way. Just in this specific situation.