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What's a good height to make an overpass? Will be running 1/32, maybe1/24. I don't really see any Fly or Scaley trucks on it
Thanks

Clearence for the cars is not the only issue when you have a track with an overpass. You might have to reach under the bridge to clean the track or get to crashed cars, in that case 5-6 inches would probably work OK. You would also have to be sure that the elevated portion of the track would not block your view of the rest of the track.

A lot of folks just use a Fly truck with a generous gap.

Don't do overpasses either, for the above reasons. I can only think of a couple of tracks in real life that have an overpass. Suzuka being one.