Again, in principle I agree, at least on motorways and rural roads. But then shouldn't drivers have the right to drive at the limit
Which is different from:
or if the deem it prudent, for example bad weather below it? - should they be forced to drive illegally or dangerously merely because it's an inconvenience to others who want to drive faster regardless of risk? Look at fog or heavy rain, people drive like idiots, speed being only one factor, the results are predictable.
It's not a "right"; it's a responsibility to drive more safely in all conditions, and that includes going with the flow of faster traffic in clear weather. And, yes, everyone should drive slower in bad weather.
Choosing to go slower than everyone else is just as bad, IMO, as choosing to go faster.
(side note: we don't have a requirement for rear-facing fog lights in the US. Instead, in rainy or foggy conditions, you'll see regular-brightness taillights, flashing hazard lights, and even no lights at all -- and these are all moving vehicles. It's fucking confusing, and it's even more dangerous than it should be.)
Again, I don't disagree, after all as you say that's why there limits, not every driver has the ability to properly and safely control a vehicle at high speed - high speed being rather subjective of course.
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Many modern cars have better performance than 'race/rally' cars of 20-30 of years ago but driving standards seem to be steadily declining, many of today's cars out perform their drivers, they are crammed with safety devices that can lull drivers into a false sense of over confidence.
On the flip side look at Autobahns, some are unrestricted yet have lower accident rates than some restricted roads. Modern vehicle safety, effective traffic management when coupled with high quality road construction and maintenance probably leading to reduced delay induced frustration must be factors there.
One big factor that you didn't mention: driver education. Here, it sucks. Really, it sucks. It's an embarrassment. Driver education is awful, and it does nothing to teach drivers what will really happen with their car. It also does nothing to teach the many true "rules of the road" that, at the moment, are only learned after a decade or more of experience.
The ability to drive a car is not genetic predisposition, it's a skill. And, just like any other skill, it's learned, which means that it must be taught correctly and thoroughly.
The Germans, after much difficult training, earn their place on the unrestricted sections of their autobahn, but most US drivers would lose their minds instead. We -- unfortunately, IMO -- view driving as a "right", and tend to make it as easy as possible to obtain a license. My own driving test was basically a drive around the block, with no time given to evasive maneuvering, high-speed highway driving, or snowy or icy weather. It even took me a long time to discover the best way to set my rear view mirrors.
It's my belief that if drivers thoroughly understand the consequences of their actions they will be much less likely to drive dangerously. Traffic fines only create fear & loathing. However, as they say, "knowledge is power", and once people begin to understand the responsibility they have to drive correctly and enable the smooth and safe flow of traffic, things just might improve.