Some traffic signals fail to detect motorcycles because the sensor loop is calibrated for larger vehicles. In Colorado, after waiting through one full red-light cycle that does not change, you may:

1. Continue waiting forever
2. Carefully proceed through the red signal after yielding to all conflicting traffic, treating the failed signal as a stop sign ("dead red" rule)
3. Run the light at full speed
4. Make a U-turn from the left-turn lane