EVERYONE in Maryland seems to put on their flashers as soon as the rain starts. It's the dumbest move ever. Putting on your flashers like that with a 7 ton rig behind you or worse yet, a 40 ton tractor trailer, forces the larger vehicle to think about maneuvering around you in bad weather because we aren't sure if you're having an emergency or just being stupid.
Hazard lights are meant to allow someone to spot you amongst other cars in traffic in case of emergency. If everyone has their hazard lights on, the police, ambulance or anyone else would never be able to find the one person in the crowd with an actual emergency.