basingwerk wrote:
Fundamentally, JT, it takes us to the conclusion that you can't predict a safe speed based on what you see up ahead
SafeSpeed wrote:
Once you inject sense, reason and probability into it, it's an almost perfect rule. Obviously we can't allow for James T Kirk materialising at an inconvenient location, but then that isn't very likely is it?
As Kirk is a TV character, so you are right on that! I have no problem with "sense" or "reason", I quite like the idea of attentively scanning the road ahead for problems and setting your speed such that you can stop before you reach them. Nobody could quibble with a sensible and reasonable approach like that. The rule is concisely and grammatically well formed to convey this notion well. But there is a slight problem with the 'probability' term that you have introduced - it runs from 0 through 1 and your rule doesn't mention when it becomes an issue. In fact, I'd say that is a problem with your rule as it stands. It doesn’t account for the small probabilities that something goes wrong. When these small probabilities are repeated over millions of driver miles, many accidents do happen. The small probabilities exist because a) you haven’t applied the rule properly or b) some else crosses your path or c) something goes wrong with you or d) something goes wrong with your car or e) something 'unforeseeable' happens etc. It also doesn’t account for the other road users who cross your path when something goes wrong, either because a)
they haven’t applied the rule properly or b) something goes wrong with
them or c) something goes wrong with
their car or e) something 'unforeseeable' happens to
them. We are only human. When something like that happens, we need the safety net of the speed limit to take the edge off things.
SafeSpeed wrote:
I can count the number of "unexpectable" events in my last 20 years of driving on the fingers of one hand. Even then I've been well managed and lucky enough to have a margin for error. Your underlying assumption seems to be that other road users appear from nowhere. Let me assure you that they can't do that.
You are one of many lucky or good drivers who have survived. I am sure that you have offset your experiences against multiple repetitions of the same risk by many drivers over many years. These risks add up to hundreds of thousands of crashes. Each one could have been avoided via management, luck and error margin, but wasn't. Absolute top speed limits give error margin to the overall system, and they should be preserved and enforced, although a good process is required for setting them appropriately.