Signal magnet

According to California motor vehicle regulations, bicyclists have all the rights and responsibilities of drivers of motorized vehicles on public roadways from which they are not specifically prohibited. Among these rights is the right to use the left-turn lane to turn left at an intersection. The problem is that many traffic signals, including but not limited to almost all left turn signals, activate only when they detect a vehicle in a particular position on the roadway. The large circles cut into pavement at intersections are wires. When a car idles over one of these circles, the engine generates a strong magnetic field, which in turn induces an electrical current in the wire buried under the pavement below. This system works great for cars, but not for bicycles. When there are no cars handy to trip the signal, cyclists are forced to dismount and cross intersections as pedestrians, or break the law in order to continue pedaling through the intersection. In cases where a smaller street intersects a larger street with more traffic volume, the traffic light is often set such that it never stops traffic on the high-volume roadway unless the sensor detects a car in any lane on the smaller street. This again is very inconvenient, since many such intersections to not possess adequate pedestrian crosswalks. Solution: an electromagnet that stores momentum while the bicycle is either moving or braking, and generates a magnetic field discharge powerful enough to trip traffic signals. Any suggestions on feasibility, design, and implimentation?