how to reduce the the traffic that is caused by the traffic lights.

how to reduce the the traffic that is caused by the traffic lights. For example, people are waiting for a long time in an intersection while most of the other intersection has no cars. And that causes a major traffic problem. And in one of the paper's parts i'm required to suggest 3 solutions for the problem and choose one of them. I must compare them and show the disadvantages of the solutions and the advantages and then pick one of them as the solution. The solutions are 1-megnatic induction loops 2-video sensor (camera) 3-piezoelectric sensors. I need to right a paper to show why is the piezoelectric sensor is the best choice. I also need to about 600 words one page single space. I need at least 4 sources.