When pressure is applied to the piezoelectric plates, a negative charge is then produced on the “expanded” side while a positive charge is produced on the “compressed” side . Once the pressure stops compressing the plates, electric current flows through the material again. Electromechanical sensors will be placed inside popular areas and road sections. When cars pass these sensors, they depress the plates and the kinetic energy lost in slowing down is transmitted from the car to the plates. A popular example is walking and foot pressing. If you use the walking motion instead of driving, a single step would cause pressure to be applied to the plates as you step on these piezoelectric plates; the load produced is captured by sensors located in the ground. This charge is then converted into an electrical charge by a piezoelectric material, generally in the form of a crystal or ceramic. This electrical energy is then stored and used as a power source. One step can produce enough energy to light two 60 watt bulbs for one