There's a road in Berlin (and probably it's not an exception) that has overhead displays showing how fast you should go to be on a green wave. At least that's how I understood how it works from driving there several times. Additionally it has variable number of lanes for each direction signaled by lights.

Here it's street view of the road, it's not perfectly visible, because those are LED displays: https://goo.gl/maps/T7RzQCUS4nk3QVZN9