You can get small commercial vehicles/delivery trucks down most of the streets in Zurich. Cars are also expected to make way for emergency vehicles, and as the

You can get small commercial vehicles/delivery trucks down most of the streets in Zurich. Cars are also expected to make way for emergency vehicles, and as the other poster mentioned, emergency can use the rail lane when they need to. Drivers are expected to keep crosswalks open at all times. Pedestrians at crosswalks also have the right of way, and it's extensively enforced. A lot of the junctions also have cameras - it's on you if you get stuck in one after the signals change, and the fines aren't cheap.