Valid point but in observing what is going on around you you cannot watch everything at once. Humans only have about a 10cm focal point that we can see and concentrate on. You need to prioritise. Everything else is peripheral. Now, what is more important - watching that guy about to lane change in front of you whilst you have a b-double on your arse - or make sure you stick to a predetermined, lazily enforced speed limit that was put there 15 yrs ago when some guy in your capital city put in some values into an old outdated computer program, and that is what spat out?
I prefer to drive by the IAM (Institute of Advanced Motorist - long running UK charity endorsed by the UK police, members of which have really low crash rates) system of driving - in the following order you always think about
your observation of hazards >position on the road>speed of vehicle to negotiate hazard safely>gear is correct to negotiate hazard>accelerate away from hazard. RTA/Vicroads system of driving is
wear your belt> don't drink and drive> obey the speed limit> stop every two hours> you will never ever have a crash.
Yes some people choose to speed, and 99.999% of the time nothing at all happens. Lets look at the probability of accident in certain situations....
Lets say the average motorist will have 0.016 crashes/yr (based on nsw figures). Taking this as a Poisson distribution this equates to (after some maths) an 11,000/1 chance you will have a crash on a 100km trip. If you drove at a speed that mathematically doubled your chance of a crash, that is still 'only' a 5500/1 risk of having a crash, whilst driving like a maniac. (mathematically, crash risk goes up with a 3rd to 4th power relationship). Mathematically, increasing your speed to 22% faster than average traffic speed doubles the risk of crash (i.e. doing 122 in a 100 zone) - this can be worked out via calculus (won't bore y'all with that...). So that is when the 'radar trap' is 100km long. For a typical point-to-point setup of say 25km, driving like a 'hoon' your crash risk is only 1/25,000. Now the average radar trap may only be 1km (visibility from cop car to you - at the most!) - crash risk, even with 'doubled crash risk' is about 570,000/1. So how is behaviour in which there is a 570,000/1 chance of a negative outcome (i.e. a towaway crash at least) worth a $300 ticket???.
Fair suck of the sauce bottle......
However this is a gross overgeneralisation. 'True' risk comes from your ability, your vehicle's ability, presence of hazards etc. If you are going 10km under the speed limit and you go through a red light just as a car has green priority and the timing is right, crash risk is 100%.