My new city project involves making all of my residential areas inescapable for traffic (only one-way roads going in, no way to go out), which makes it impossible for anyone to drive to work, instead everyone walks or uses transit. Even all of my industrial and commercial areas have a very rigid one-way road system, which breaks down like this:
External connections -> Industry -> External connections (imports and exports)
Industry -> Commercial (supply for local sellers)
External Connections -> Residential (necessary for people arriving at their homes the first time).
Eventually, every neighbourhood got its own services, but early on, I could just locate services outside the one way region. Fire trucks and such will make their calls as normal, but then finding no way back to the station, they'll disappear and simply respawn at the station.
My city that uses this is still small, but it seems extremely effective and should be pretty scalable.
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