I think many in the comments are misunderstanding how this works, perhaps because it's not clearly explained, but my understanding is that they want to integrat

I think many in the comments are misunderstanding how this works, perhaps because it's not clearly explained, but my understanding is that they want to integrate with your navigation software so that they can predict (based on the routes of drivers navigating with a supported app) when certain vehicles will reach certain lights and adjust the timing so as not to cause traffic to have to slow down. The only way to do this effectively is with a planned route, and hence why they need to use an app (the one you're using to navigate/route plan with) and why having the main navigation apps people tend to use (e.g. Waze, GMaps) is desirable.