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long island's ocean parkway usues air rader. every quarter mile there is a horizontal hashmark...when you pass it they time you till you reach the next hash mark (1/4 mile
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#7 (permalink) |
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A True Z Fanatic
Join Date: Jan 2011
Location: New York City
Posts: 2,546
Drives: Fiat?
Rep Power: 21 ![]() ![]() ![]() ![]() |
long island's ocean parkway usues air rader.
every quarter mile there is a horizontal hashmark...when you pass it they time you till you reach the next hash mark (1/4 mile away), and divide your time by distance, and come up with your speed... they dont do this very often as airplanes/helicopters are not cheap to run...
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