Tom, that's happening anywhere near the full eclipse line -- Colorado is banning wide/oversized loads until two or three days after the eclipse, for fear of traffic problems. Wyoming is doing the same from Aug 20-22. The news is full of preps for the expected extra heavy traffic, including the highway patrol changing the distribution of their troopers to handle the expected traffic jams. It's being compared to a holiday weekend, only worse, even here in Colorado (Denver is in the 92% zone). And not just interstates -- U.S. and state highways are subject to the same problem. The news last night reported that one hotel in Casper (center of totality area) is getting $2500 for the night before the eclipse.
In other words, madness everywhere.