Had to do a motorway awareness course recently, it was actually fairly interesting and probably not a bad thing to stop and reflect occasionally on how you drive, given the potential consequences should things go wrong. Some things I learned
- variable speed limits are often triggered automatically due to monitoring of traffic rate and speed to allow a greater volume of traffic to flow in a given time
- the most likely way for a road worker to die is by being hit by a traffic cone, which weigh in excess of 10kg, hence speed reductions through road works. More and more roadworks are being done at night on closed motorways as drivers will not adhere to the reduced limits
- most modern cars have an crawling mode which essentially allows the car to continue moving at around 20mph if there is a fault i.e. engine management problem. The purpose of this is to allow you to continue to reach an exit from a motorway or NSL A road.
- in dry conditions, at the point at which you would stop after braking from 70mph, you would still be travelling at 17mph if you were doing 72mph when you began breaking
- in a frontal collision at 70mph, you will almost certainly die. On the graph of speed to percentage mortality in a frontal collision, the gradient of the line gets awfully steep once you go beyond 40mph.
I don't have a problem with variable speed limit motorways but the plain fact is that people have died due to hard shoulders being removed who would not have died otherwise. They should not have been removed. The main change I have made since the course is to keep to the 2 second rule regarding distance from the car in front. Remember that becomes 4 seconds in wet conditions.