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Alaska/Major roads/Main

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Major_roads/Main: Adding road elevation policy, approved by AOTB 12/5/2016
State Highways - AK-### <br />
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==== Road Elevations ====
 
These are the general guidelines for elevation in Alaska:
* Drivable and non-drivable segments are handled the same way with elevation.
* Set elevation to ground in most cases.
** Segment(s) passing over other segment(s), rivers, major waterways, and ''all bridges'' shall have higher elevation, relative to ground.
** Only elevate/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 Alaska.
** 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.
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