TheoTown

I used one way road and the road is still red, help me

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Remove traffic lights, Not to many intersections, use highways, look where the cars come from, use elevated roads

Have multiple ways to get to destinations, for example 2 ways to get to an industrial area from a commercial area, roads that have a lot of traffic more than likely need an interchange so build them in any 3 or 4 way intersections. Remember that every car has a destination and will take the quickest way to get there.