: Only authorized emergency vehicles (police, fire, ambulance) are permitted to use blue flashing beacons. These vehicles may also use alternating headlamp flashers for better visibility.
: These should only be used when a vehicle is stationary and causing a temporary obstruction, or to warn following drivers on motorways of an obstruction ahead. Fishing Equipment uk flashers
: Vehicle direction indicators must flash at a constant rate of 60 to 120 times per minute. : Only authorized emergency vehicles (police
Under the UK Highway Code Rule 110 , you should only flash your headlights to let other road users know you are there. uk flashers
In the context of angling, a "flasher" is a type of attractor used to lure fish.