When the boyz here set up check points..sometimes they will park 2 cars back to back in the center of the road with the strobes and wig wags going. So not only is the light bar blinding you..you have high beam headlights blasting you as well.

My last stop like this I and daughter was comming home from the NE Submachinegun match into town about 2 am, so called click it or ticket seatbelt check program which is a bullshit cop-out for checking for drunk after the bars close.

So anyway they had stupid Iowa cops helping who are scared shitless of guns.  My cop quizzing me with my loaded handguns on the dash and a belt fed Browning 1919A6 standing in the back of the van asked local deputy Chris to come over to my car. He said Chris what do we do with these people and thier car full of guns.  Chris being a Nebraska cop told scared Iowa officer dude, we send them home that's what we do.

As for flashing lights I don't remember any, seems to me like it was cops in the street with flashlights waving everyone over into local business parking lot.