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As far as I remember, we were required to put mile markers exactly every 1.00 mile, unless there was an on-ramp or other obstruction, when I worked on the highway crew. Also, the delineators (spell check?) should be exactly 1/10th of a mile, except around curves and on-ramps, where it goes to 1/20th of a mile.
I'm not saying the bossman would grab his surveying equipment to verify each post, but I'd generally trust those markers more than my odometer.
(edit; We didn't measure the distances personally, it was all from the blueprints)
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