A long flat straight road from Colorado to Nebraska......hmmm, that looks like fun.
I'll give one away here, SR 97 from the Columbia River Gorge to Yakima........sage brush and tumbleweeds with elevation changes and twisties straight out of the wild west. Nothing out there but rattlers and coyotes.
It's funny really that Washington on Oregon are supposed to be all evergreens and lakes and stuff. From the Cascades to the coast, yes but the other 75% of both states is desert sage brush and tumbleweeds so bleak a rattlesnake has to carry a lunch pail...Why do you think they stuck the Hanford Nuke plant out there?
Highways 12, 24, and 95 in southern Utah. Astounding beauty, 5 National Parks and Recreation Area (Zion, Bryce, Capitol Reef, Lake Powell, and Natural Bridges), 24 and 95 are empty enough that you can go hours without seeing another vehicle, and the low vegetation gives good sightlines and makes it pretty difficult for a LEO or an animal large enough that you can't run it over to hide.
Highway 191 in Arizona near the NM border from Alpine to Clifton. Long, twisty, beautiful scenery. It reminds me of a desert version of the Cherohala.
341/Push Mountain Rd/the "AR Gap" and its switchbacks and decreasing radius curves, and a general-lack of Enforcement is another one not to be missed if you get to this area. It's just off 7, I've ridden through there many times. Stop for a lunch at The Cliff House; really good food.
For anyone that's in the area, the Ohio River Scenic Byway across southern Indiana between Evansville and Louisville is a great ride. Not much traffic, lots of curves, great scenery, and excellent pavement make it a nice trip.
I ride parts of it when I have to head to the Louisville area for work, though that will be on hold for a while since a lady pulled out in front of me this past Monday and took out my new (to me) 2002 Suzuki Bandit 1200. Oh well, at least I got a good two weeks out of the bike before the accident. On the bright side, that means I get to go bike shopping again!