There is a pretty easy explanation for why traffic counts are minimal on US-95 going Northwest out of Las Vegas: the route absolutely sucks ass as any sort of long distance travel route. It sucks for every reason a highway could suck. Between Vegas and Reno the route has as indirect a route as it gets. It's only 2 lanes and thru very desolate territory, making it great for road hypnosis and potential head-on collisions -or at least potentially running out of fuel. North of Reno, going into Northern California and Southern Oregon isn't much better. I can't imagine anyone driving trucks or other commercial vehicles using that current corridor as a "short cut" or alternative to I-5.
Most of the existing Interstates that cross parts of the Western US go through desolate territory almost devoid of population. But those routes eventually go to big destinations. Being able to drive fast/efficient from Seattle to Phoenix shouldn't be all that different than Seattle to Minneapolis.
Oh, it does not suck for every possible reason a highway could suck. How about counting our blessings?
- US 95 has 12 foot lanes and similar weigh limits and height limits as interstates. There's no barrier to big rigs.
- the route from Las Vegas to Reno is not absolutely straight, due to topography. Even if Nevada wanted to go to the expense of building a route dead straight over pretty high mountain ranges, they'd get no thanks for doing so when in the winter traffic was forced up into the ice and snow zone instead of going around the tall mountains like a sensible road.
- 2 lanes is ample for the amount of traffic it gets.
- Road hypnosis is actually less on 2-lane roads than on freeways.
- Lack of gas stations results from lack of traffic, and building a freeway where few people want to drive is not going to make more gas stations open.
There's precious little need for I-11 at all, and none for I-11 north of Las Vegas.