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Idaho/Major roads/Main

142 bytes added, 3 years ago
Major_roads/Main: Clarifications and updates to policy, approved by AOTB 12/5/2016
These are the general guidelines for elevation in Idaho:
* Drivable and non-drivable segments are handled the same way with elevation.
* Set elevation to Ground on all non-tunneled segments that are not ground in most cases.** Segment(s) passing over/beneath another other segment or waterway.* Only segments that "cannot see the sky" should (s), rivers, major waterways, and ''all bridges'' shall have negative higher elevation (i.e. tunnels), relative to ground.** Only set elevation as high as necessaryelevate/lower the actual bridge/tunnel section of the road.
** Elevation of overlapping segments should be set relative to each other, with the lowest segment as Ground (unless a tunnel).
** Tunneled segments shall have lower elevation, relative to ground.
** Only segments that "cannot see the sky" should have negative elevation (i.e. tunnels).
** Only set elevation as low/high as necessary.
* If you use the Bridge tool to join segments, be aware that it raises the elevation of the joined segment. Lower the joined segment as appropriate.
* [[Elevation_-_bringing_the_Seagull_to_Australia|"Seagull"]] guidelines apply to elevation in Idaho.
** Only elevate/lower the actual bridge/tunnel section of the road.
** Bridges should be cut at the start/end of the bridge.
** Tunnels should be cut at least 15m /50ft '''before''' and '''after''' the tunnel, to allow time for the GPS to regain signal.
** Do not cut segments for elevation purposes if the bridge/tunnel starts/stops within 60m/200ft of an existing junction.