Hi Dave! I've been crazily working on a Civil War project that takes up WAY more time than I thought it would. I spend about three hours a day writing and researching for the Civil War Daily Gazette, a blog that covers the CW one day at a time, 150 years later. Quite a bit of fun. But alas, I have no free time. For the next four years. 
That said, I *did* just return from a run to Utah/Nevada and hit some of the Lincoln Highway as well as the 100 mile stretch of the abandoned Central Pacific RR bed west of Promontory/Golden Spike.
I should do a bit of a post about it, even though it's not really a highway in the traditional sense.
As for the screencaps above, the shooting was mostly in and around New York. I've been up and down the Jersey shore, but have never seen anything like this. One possibility is that the road is real, but the ocean is fake/CGI'd in. Actually, that's quite probable. The grass on either side of the road isn't really specific to anywhere in particular. It could be a stretch of Route 66 concrete in Califoria for all I can tell.
Sarah and I recently did the Cascade Loop, with a stop by Spencer. We also hit Washing State Route 11 (Old Pacific Highway) and have done a couple of alignments of the PH up to Bellingham.
When will we hear about what you're researching? Odd bits of road still thrill me to no end. Can't wait!
-Eric
Eric,
I am really pleased to learn that you and Sarah (say "Hello" for me) are still enjoying road trips! I hope you will share some of your experiences.
My great grandfather was in the Jayhawkers Union regiment (7th Kansas Cavalry) and had some tangles with Quantrill, and did some border raiding, and some bushwhacker hunting. His diary was used extensively in a book on the 7th describing their exploits in Missouri, Mississippi, Tennessee, and of course Kansas during the War. By accident I am probably the living expert on the 7th.
I invited Denny G to meet me on his way back from the Lincoln Highway trip to scout out the section I have identified because it is potentially on his route home (see my post in his LH Conference thread). I don't know if he is going to take me up on it, but I would extend an invitation to you as well, and to any other active members who can pick up and go on a moments notice to the southern Idaho area. Send me an email via the forum to inquire.
Of course when I get back, I will post a map and share the details with all. It might be a bust, but I get some jollies from discovering, or at least reporting, on this kind of thing. In this case we have three transcontinental trips that took what is now a long abandoned route, and so far as I can tell, no one has identified the exact route as such.
Dave
Keep the Show on the Road!