Lights in particular are a hard problem. Depending on timing, some are a 3 minute wait, or none at all. If someone can start to model traffic light timing, it could really improve flow.
Yes. Waze has a lot of data on how people are moving on the streets, so I'd think they'd be able to figure in the average wait at any given traffic light. Maybe they do factor that in somehow, but I've seen no evidence of that. Any time sitting at a stop light seems to just extend my estimated arrival time by that amount.
