Looking into it, its only if you flash your high beams repeatedly ( not once ) - and its based on the only vehicles allowed to have flashing lights are emergency vehicles or something like that.

Also, for me I was stated that I was interfering with police operations and was about to get hit with a pretty nice fine - I told them I didn't know there was a speed trap and accidently hit my high beam switch.

Now if you are warning of a hazard up ahead, that's actually allowable.

Truth of the matter is it varies area to area, and in the end the police will 99% have no evidence, so plead not guilty ( like I did ) and it gets dismissed.