Difficult Terrain or steep grade POI

Wow, a good idea. (I bet even bicyclists might like to see it )

But it does sound like a tough one to get data for creation of the POI file.

I'm not sure but this may be marked on maps for truckers. They are rather expensive, but got many informations helpful for heavy trucks.
With POI problem will be probably with distance to it: they will probably need to be set as point to avoid when calculating route. Otherwise steep grades are marked on road before them, and when they are especially dangerous it is really hard to miss those warnings and line to check brakes.

Check this link:

http://www.poi-factory.com/node/22609

I had put this together not long ago. Is this something like you were looking for? These are on paved roads only, all have elevations, most have grades also.

Thank you so much that is what I am looking for but I'd like to see one for all 50 states
Yea- extensive
I'll bet even the work you did was enormous
I am in WA and OR and am interested in terrain, road and altitude for the Northwest
Thanks for your reply guys

This is more or less how I started the file I posted. This will give you basic info on passes in Washington with roads and elevations. http://www.wsdot.wa.gov/traffic/passes/text.aspx

I used Google Earth to pinpoint the locations and then searched for other sources that may list highway grade info. Sometimes the road signs were visible in the street level photos on GE.

Here is a publication that contains exactly what you asked for. Unfortunately in print only. But it would seem this is a good source for a POI project.

http://www.mountaindirectory.com/

What about humps that would cause a double drop trailer (or RV/motor-coach) to high-center?

As suggested, The Mountain Directory is a good source to use for this. A couple of years ago, a CD version was produced but since discontinued. I used to know the reasoning but that is irrelavent now. Try a search on Amazon or your favorite online book store's website and see if you can find it, possibly used. It might help until a POI of all fifty states is created or until the Manufacturers wise up and add steep hills as an avoid to their gps's. Mountain Directory has allowed me to decide Whether to bypass the grade, if there is a way, or take it. Even truck friendly mapping programs only warn, they don't avoid. I hope this helps a little at least.

TXRVer is the location at an exit just before the climb? It would seem appropreate to get a warning a mile or so before your last chance to get off.

The intent of the file was to provide a database of high passes with grade info whenever I was able to determine it. I use it for planning a route; let the nüvi chart a course and then go back and add these as waypoints along the way. From that I can decide if an alternate route is feasible.

I understand what you're asking, but I don't know how to implement it other than converting it to a .gpx and applying a proximity warning of several miles. To avoid a 7% grade at 10,000' may mean making a detour 50 or more miles back in some cases.