thank you all for your advice and permit me one small story.
Time: 1972
Place: One of the Southern California freeways - somewhere within 100 miles of LA.
I'm towing a Skamper popup and see a little old lady (hey - I was younger then!) in a pill box hat and white gloves driving a 62 or 63 Chevy BelAir comes up the entrance ramp. I pull to the middle lane to give her room and pull back once I clear her.
About 45 seconds later she blows by on the left doing at least 75 and went right on out of sight. I then realized that traffic patterns were somewhat different in LA!