120 is on the high side, but on big empty roads with light traffic and great visibility, e.g. eastern Washington, I've seen packs of cars pushing 100 pretty reg

120 is on the high side, but on big empty roads with light traffic and great visibility, e.g. eastern Washington, I've seen packs of cars pushing 100 pretty regularly. Modern cars, modern tires, it's probably a good bit safer than going 55 was in the 70s.