The only city map in the default game is West Coast USA. It's a good map, but it has some problems: The actual city part is only a small portion of the map It's too hilly to drive hard without wrecking your suspension or worse Also, there are plenty of American maps, and at least a few European maps, but there are no Asian maps. I think a fully-city Japanese map would make the game more diverse (Plus, people like me can pretend their playing Need For Speed without catching air, losing control, and wrapping their vehicle around a tree)
i've always thought WCU should have less biomes and be 4x4 The issue is that making a proper city map isn't easy, you need each building to be an individual unique object most of the time and the poly count would be insanely high. Im pretty sure cities are more resource intensives than jungles for many videogames, since at least with jungles most peopl wont notice identical trees or bushes.
A Japanese map would feel entirely naked without mountains bordering the city with some intense touge roads carved through them leading to some small mountain towns. Maybe a map based on NFS Carbon so us canyon carvers can have our fun while the street racers can rip through those marketplaces and neighborhoods? Lol
or some one could update the c1 expressway that already exists on the forum but only with that authors aprovement https://www.beamng.com/threads/tokyos-shuto-c1-expressway.61259/