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Old 02-24-2017, 03:54 PM   #16
Tcoat
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Quote:
Originally Posted by Borchert97 View Post
I always use the electronic speed warning signs around the city to gauge a vehicle's accuracy. As OP said, a lot of vehicles do understate their own speed. I'll go by an electronic sign indicating, for example 25 mph, at 32 mph, but the sign tells me I'm going 29 mph.
Again not a great way since they can vary even more than GPS or the speedometer. Those signs are just designed to be in the general ballpark and are not a precision device.
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