Some people have... hobbies. I'm sure there's more than one person who's spent a week driving 3597 miles in a big circle (that's at least 8 hours of road time per day), starting in Houston TX, hitting various tourist spots along the way, and ending up back in Houston.

But, I doubt whether too many people have done so with a radiation monitor and a GPS.

And, I'm sure there's only one person who's put a graph of the trip mapping elevation and radiation levels on their web site.