basingwerk wrote:
SafeSpeed wrote:
Ok. Serious question for you Basingwerk. What is the reason (or reasons) why we have a general speed limit?
One reason is due to a shortcoming in the SafeSpeed rule that Pete317 has observed. It says that drivers must drive such that they can stop within the distance they know is clear.
Copied off the Background page:
Always ensure that you can stop comfortably, on your own side of the road, within the distance that you know to be clear.I've always thought there's an unwritten caveat covering what "know" means. I don't want to Clintonize the word, but you're taking it as an absolute and I don't think it's meant that way. If we take it to mean "reasonably expect" it takes into account potential hazards. For example, the presence of driveways means someone might reverse out of one of them, very cold weather could mean there's ice on the road, and there could be mud on a road with fields either side. If you interpret the Safe Speed rule to be:
Always ensure that you can stop comfortably, on your own side of the road, within the distance that you can reasonably expect to be clear....and you don't spontaneously slow down to take account of potential hazards (within reason) as well as actual hazards, then you're not driving within that rule. (I'm sure this was all in another thread a while back).
basingwerk wrote:
Speed limits, on the other hand, provide a compromise between fair progress and low risk and work in conjuction with the SafeSpeed rule.
Look at it like this, if all drivers followed that rule all the time from the day they passed their tests, would we need limits at all? Probably not. But since not all drivers are going to follow the rule limits are worth having for those that don't, right? Well, up to a point anyway

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I think it's a mistake to view limits as a compromise between progress and low risk for the simple reason that limits are inherently poor at coping with constantly changing levels of risk. The level of risk isn't even necessarily the same for two drivers on the same bit of road at the same time, let alone different times of day, weather, traffic levels and so on. Even variable limits would do a poor job. It must be down to drivers to assess risk, though I'd agree that we need to be better at it than we are.