My bias ply tires were less than a year old when we went to Kentucky. They run fine on blacktop and smooth concrete. The problem is when the tires are on a concrete highway with the grooves cut in them running parallel/the way the car is going that you have to constantly correct the steering. I think they cut these grooves for safety driving in wet, icy, snow conditions. The wife suggested going back roads and just add a day to our travels that might be a fun way to travel.
Regards,
Bob