Yeah happens to me a lot too. I stopped at a path crossing today as the pedestrian/cycle light was flashing red. I could have started to cross but there was a line of traffic waiting to cross and several other cyclists had already crossed several seconds before I got there. A lorry (errr... whatever that is in American English) was waiting for me until I flagged them on... nice of the driver to wait, but there was never any chance I would've darted out in front of that vehicle on a flashing red.