Going North on Highway 321,which is a four lane divided highway, the speed limit is 40 mph in a fairly congested area which is reasonable. After you leave the congested area toward the junction of Highway 70 the area is not congested. The police position themselves 200-300 yards outside the congested area where the speed limit is still 40 mph. I was ticked in this area at midnight at 55 mph, really going 52 mph. The volume of traffic at this late hour is roughly one car passing through every 30-60 seconds.