Call your local DOT shop and register a complaint and/or ask to talk to an engineer. Try to find out when it will be done, and call back after a week if it hasn't been done, or still isn't sensitive enough.

If they can increase the sensitivity, great! Alas, not all sensors are adjustable. We have some old ones around here that cannot have the sensitivity increased. Your only recourse is to press the pedestrian walk button if there is one, wait for a car, or run the light (when it's clear).