5 mph limit increments

Honest John Back Room » Motoring discussion
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Sun 27 Nov 2005 13:36
5 mph limit increments - sierraman
Watching something American recently I noticed a 25 mph speed limit sign.This made me wonder why our speed limits are in multiples of ten,on public roads anyway.The only theory I have come up with is in relation to speedometer markings,and maybe in the past they were not clear enough(I am thinking of my first car,an Anglia,as an example)or not accurate enough.Any other theories?
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Sun 27 Nov 2005 13:40
5 mph limit increments - jc
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Funny as it was, I think it best not to be posted here - DD
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Sun 27 Nov 2005 15:25
5 mph limit increments - Andrew-T
Thinking back 40 years to my time in Canada (Alberta), I seem to remember that many (if not all) limits on out-of-town roads ended in 5 and not zero. Not only that, but there were Night limits, usually 10 less than the Day limit; the Night signs being white or reflective numbers on a black background so that they showed up more strongly in headlights. Perhaps the thinking was that a limit ending in 5 is more memorable?
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