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Old 08-15-2014, 09:50 AM   #11
JayG
On the slippery slope
 
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Join Date: Mar 2014
Location: Austin and Palm Springs
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Quote:
Originally Posted by Giller View Post
Curious - generally speaking, if the speed limit shows 55 MPH - what, if any, is a general accepted margin of error in the US? Here in Canada, on our major roads, you want to be within 15-20 KM/H (my rule of thumb is stay within 20% of the posted limit) - never had a problem in 20 years when I followed this.
the speed limit is just that a limit. It is an absolute number

That being said, most cops give you a little wiggle room. I would think 5 mph is probably what most allow, some maybe 10.

I like the fact my speedo reads about 3-4 mpg fast. So if I want to make sure I am at or under the limit, I keep the speedo at the posted speed.
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