There are a handful of things like The Silver State Classic, but for whatever reason, I don't care for the format, particularly the Silver State Classic, with their crazy rules, rookie classes, and if you break out of your class, the Highway Patrol will TICKET you!
There's also at least one in either Nebraska or Kansas, but I forget the names of them, when or where exactly.
They shut down a long length of road and let you run on it, but they typically have restrictions on how you run that make it unappealing for me.
I like the Standing Mile format, typically unrestricted speed (some exceptions), and the ability to run repetitively, trap speed tickets 🎟 , paddocks for adjustments, ability to talk with other drivers, etc.
The highway 🛣 is (from what I gather) just showing up, wait for your turn, and go, usually just one run, restricted speeds, get to the end and go home.