Speeding PM

As the herald observes it takes one hell of a car and a long straight for you to reach 180kmph and not know that you are going that fast.
Worse yet you will notice when you slow down for another vehicle or do a little fast moving changing of lanes and then look out the window and realise after some considerable breaking you are still doing 100kmph.
It is not credible that she was not know they were going over the speed limit.