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Elevations should be mapped more-or-less realistically, with elevation numbers showing where the higher-elevation segments above lower-elevation segments.
- If a seagull can fly right under it, it’s a bridge (level greather than 0).
- A road is only level = +2 if there’s another bridge (+1) running underneath it.
- If it is underground, it’s a tunnel (level lower than 0)
- For every other case the road is ground level (level = Ground), even if it’s artificially elevated or dug under street level.
- Tight Marking. We mark bridges with level = +1. In some cases we will need to split segments into two or more segments to mark only the right parts of the road as a bridge or a tunnel. This is Tight Marking.
- At interchanges, where there is already a nearby junction, it will not be necessary to use "tight" marking for an elevation change on the overpass. Use the existing junctions if at all reasonable.