Don't Go the Speed Limit on the Highway

Some Georgia State students test the speed limit on Atlanta's perimeter in this video. They create a WALL OF CARS which is shown @ 3:45 all driving 55mph. Traffic becomes congested behind them as everyone behind them on 285 must max out at 55mph and some road rage ensues. At one point a swerving van has it's mirror explode on a car sitting on the shoulder. On of their contentions is that no one drives 55mph so when someone gets a ticket going 80, should the ticket really be for 25 over? I don't think that should be the same as going, say, 50mph in a neighborhood.