Las Vegas Police chopper’s strobes often flash 4x in front then 4x in back, repeat.
Count flashes at .25x speed.
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https://www.youtube.com/watch?v=rQeMLFekCiM

LVMPD Air Support Unit Helicopter

Published on Jun 30, 2015

Las Vegas Metropolitan Police Department Air Support Unit Helicopter at the Citizens Police Academy on June 26, 2014