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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Yes, your math checks out for simple math of velocity = distance / time. (therefore; time = distance / velocity) ...and as you have it you look at the the set distance of need passing length of 50' and a relative speed difference of 15mph. This is the same as saying someone is stopped on their bike and a car is passing at 15 mph. ...and needs 50 ft to do so. ...and saying that the pass event is not over until the car is 20' past the cyclist on the side of the road.
Some people do take that much space. Many others don't.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
Last edited by island911; 06-28-2020 at 11:26 AM..
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