The attached article will help you guys while filing complaint Strobe sirens on new police cars are blinding motorists and causing accidents, claims inspector | Daily Mail Online
It has been proved that the flashing bright strobe lights can deteriorate the vision of fleeing suspect and his/her direct and peripheral vision are decreased. Police use these strobe as a tool as well to catch suspects who are on loose and being chased by police. So there is no doubt that the strobe will effect the traffic in all direction and can result in a split second blindness
They should rather use the LED bar with message in a loop as I have seen it here when they are on duty and no emergency. Which is bright and visible and as its moving message, its picked up by motorists easily. A lot of research has been done by NYPD here and they found that blue color message is easily and effectively picked in any conditions. Strobe use without emergency is not allowed at all.