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Question from a Canadian
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.
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2011 Boxster 987.2 Arctic silver / Black leather, PDK with Sports Chrono Package Plus
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