I don’t think this involves faster traffic. Speed limits would still be there. I think they’re trying to reduce idling. Idling engines are wasteful source of pollution.
For everything in this world there are trade-offs a win for someone might be a detriment to someone else. That’s just the way of the world.
Better public transportation would be good. Cycling and pedestrian friendly cities & towns would also be good. To me those are not connected to this. Those are better addressed by government alone. If these things are important to you I’d recommend that you go to a city/town council meeting and make your voice heard. To me this is specifically about trying to improve traffic flow and reduce pollution.