I’m planning to try and build an offset hex grid city
Basically there’s one hex pattern for car traffic, and an offset hex pattern that’s for pedestrians and cyclists, and where there’s any intersections between the two, the car traffic gets raised to give pedestrian traffic an underpass.
Also every car intersection is a roundabout, and I’m considering doing alternating one way lanes with every pair being bracketed by transit only lanes.
There’s also Bevy, which can infect them with the Rust mind controlling slime that makes them swear up and down that it’s an amazing game engine because it runs on Rust.
It is actually pretty good though the folks developing it are putting their A Game into it even if it’s still technically in the development phase.