The status for all interstates, federal, and state highways running through Idaho are documented here. This includes any project status pertaining to those highways, as well as any known changes coming down the pike from ITD and/or other cities as we find out about them.
State highway naming
State highways are to be named State Hwy ###
There is TTS support to name state highways as ID-### but doing this will cause the state shields to go away in the app. Until this is implemented fully, we will stick with the State Hwy ### format.
Ramp names can use the ID-### format since they do not carry shields.
County road naming
In Idaho, we have a set minimum standard for locking roads based on segment type. Any road of a certain segment type must be locked at least to the rank (level) in the chart below. Roads may be locked higher for protection and special situations (areas with construction, tricky design, frequent mistakes, imaging inaccuracies, and the like), but should not be locked lower.
A great time to implement these locks is while bringing the road types of an area into compliance with the current US road type standards (FC and highway systems). Lock the roads based on type after they've been set to current US road type standards.
Roads named N, S, E or W
If you encounter any roads that are named N, S, E, or W, you must add a period (.) to the end of the letter. For example, West N Street is abbreviated as W N. St. County Road W is abbreviated as CR-W., and so on. This ensures the TTS system reads the road name as "County Road W" and not "County Road West."
Page 2-10 of the Idaho Driver's Manual says this about U-turns:
- U-turns are not legal everywhere, so first look for prohibiting signs. When making a U-turn near a hill or curve, the law requires that you be able to see 500 feet in either direction. U-turns are prohibited in no-passing zones. Stop and yield to all traffic before completing a U-turn.
For Waze routing, u-turns should only be enabled where they provide the potential for improved routing, which includes recovering from missed turns. A common example is a median-divided primary street that has homes/businesses with their driveways/entrances directly on it, where reaching them would otherwise require lengthy, multi-turn deviations through side roads in order to end up on the correct side of the median.
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 passing over/beneath another segment or waterway.
- Only segments that "cannot see the sky" should have negative elevation (i.e. tunnels).
- Only set elevation as high as necessary.
- Elevation of overlapping segments should be set relative to each other, with the lowest segment as Ground (unless a tunnel).
- 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.
- "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 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.