Before I had earned my private license, we were up on the Anchorage--Fairbanks highway somewhere south of Cantwell, in a wide spot having lunch in the motorhome, when a Cub with a nice young couple landed on the road. The weather was drizzly, and the ceilings were pretty low. We invited them to wait out the weather with us. When the rain stopped, they took off again, only to return a few minutes later--apparently once above the trees, it didn't look all that good toward Anchorage.
After some discussion, the young man decided to wait it out with the airplane and asked if his girlfriend could ride with us back to Anchorage. He planned to fly on in when the weather lifted. We were glad to oblige.
The reasons I remember this, now some 45 years later, are a bit unique. First (of course), our guest was a looker--very pretty blond. But for reasons I can't remember, Wife 1 insisted that she should drive and I should sit in the back with our guest and the kids. That would have been fine, except that she (Wife 1) started driving too fast for the gravel road. Pretty soon I heard an unusual sound and told her to pull over. One of the duals on the right side was flat, which was a pain in the wazoo to change on that rig. I discovered a long, slender rock with a sharp pointy end about the size of a middle finger, had penetrated the tire. I still have that rock!
Although I've never had to land on a highway, I have always felt that doing that would be a whole lot better than continuing on when the weather gets in the way. One of my first airplane partners had done that before we met, landing a 172 on I-80 northwest of Laramie when a sudden snow squall enveloped Laramie. As anyone who's driven that highway knows, it may be a major east-west highway, but it's not very busy. As he described it, he just landed between vehicles and taxied into what was then a Stuckey's rest stop. After the weather cleared, he taxied back out and took off for Laramie, which was only about 10 minutes away.
Cary