70 is the rule[0], at least based on length - given rural highways have the most of it and the standard speed is 70mph. On the interstate maybe 1 in 1000 driver

70 is the rule[0], at least based on length - given rural highways have the most of it and the standard speed is 70mph. On the interstate maybe 1 in 1000 drivers in a car is actually going 65mph in the 70 zone, and by doing so is slowing down right lane traffic and requiring 70mph semi trucks to pass them. 0: https://safety.fhwa.dot.gov/speedmgt/ref_mats/fhwasa16076/fhwasa16076.pdf https://safety.fhwa.dot.gov/speedmgt/ref_mats/fhwasa16076/fh...