I figured out the roadbed sensors a long time ago and am rarely unable to trip them, except during heavy rain. I have no idea why rain would interfere.

I never seem to manage to trip the optical sensors. We're talking about the little camera thing that sits on top of the stop light or pole and looks across the intersection, right? What's the trick? I have to cross a busy road during my commute and I've watched a certain light cycle without me too many times to count. (For any Austinites, this would be crossing MLK at San Jacinto. I've recently resorted to making an illegal right on red and heading up the hill.)