How accurately waze could be able to forecast green lights?
When a wazer gets a green light, she will start moving. If this information is collected from several wazers, would it be enought to gather the traffic light interval and after that forecast next turn-to-green moment?

If this is possible, the next wazer could be given information if she need to accelerate or decelerate to arrive on greens. Following theses advices, she could get a green wave throught any wazer-populated city ;-)