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Lasergun countermeasures

The outgoing laser beam is small and focused, but what's the swept area 
of the sensor?  It would make sense for it to be as small as possible to 
deal with sun glare and day running lights.  At a large distance, a 
single IR source on your car may be within the swept area of the sensor.  
If you see the defender of justice in time, this might give you time to 
brake.  For a black car (bra?) without a front plate, an IR source near 
each headlight might be effective.  A sloped, black car with retractable 
headlights and no front plate has little to fear from laser.  Anything 
that makes the headlights/front plate less laser reflective reduces your 


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