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1.
Flashing your vehicle lights to warn other drivers of upcoming police speed traps.

A nice gesture so that other drivers don't have to pay speeding fines.

A reminder for people to slow down while driving.

Note: If ya get the signal just smile and wave back :)
Good thing that guy gave me the flash warning otherwise I would have been out $150.

by good samaritan helping out December 30, 2008

Words related to flash warning

car flash lights police signal speed speeding trap warn warning