You are correct about the misunderstanding among many drivers. But if you think it is not a requirement, remind me not to ride with you on I-20 east of Dallas. ;-)
Back in the 80s I took a road trip with 2 other guys to go skiing in Colorado.....I-20 through the DFW area was part of that.....we got passed at 8am by a chick in a Toyota Corolla......I suspect she was doing at least 100....I can’t imagine how it is now.