Ahhh...
I found that map bigfoot31415926.
I'll continue to lean on the Wahington, Utah line, until proven wrong
If they would share bits of Idaho, that would be a nice bonus
Idaho stats, largest cities and towns:
1 Boise
2 Meridian
3 Nampa
4 Idaho Falls
5 Pocatello
6 Caldwell
7 Coeur d'Alene
8 Twin Falls
9 Post Falls
10 Lewiston
On Google Maps it is as this:
Idaho city run. Alternative
view.
Boise, Meridian, Nampa and Caldwell very close to each other.
So possibly
Boise and maybe Nampa?
Idaho Falls and Pocatello.
Maybe Coeur d'Alene, but it is very close to Spokane. And Post Falls is even closer, so my bet is that PF will NOT be in.
Twin Falls.
Lewiston, it is grayish on the usa.dds from 1.32Beta. I guess it will be in at latest when Idaho gets in.
So... Boise/Nampa, Idaho Falls, Pocatello, Coeur d'Alene, Twin Falls, Lewiston.
Smaller possible places:
Dubois "reststop + fuel" Farming.
Salmon, and/or Challis "fuel/sleep" Timber
McCall if ID-55, if not, then US 95 and New Meadows. "fuel/sleep"
Ashton "fuel/sleep", too close to Idaho Falls? US 20 towards West Yellowstone, Montana.
Montpelier "fuel/sleep"
Example, without Montpelier.
/edit:
I totally forgot
Bonners Ferry in northernmost Idaho! Three Mile Station truck stop, just north of it.