In today's litigious society, a single teardrop light thrown up on the roof or slapped on the dash won't cut it in emergency responses. In the event of an accident you can guarantee a lawsuit. Even with a fully marked vehicle tricked out with the latest and greatest in LED's and state of the art siren systems can expect a heap of trouble if you strike another vehicle or hit a pedestrian in an emergency response. Ambulance drivers and other emergency vehicle operators have gone to prison after accidents when a private citizen was struck and killed. Police vehicles, ambulances and fire trucks are requesting the right of way in an emergency response, although other drivers are expected to yield and grant the right of way, the emergency vehicle operator bares the ultimate responsibility to maintain safe operation and control of his vehicle. The only vehicle that has the true right of way without having to yield for other traffic or request the right of way is your friendly neighborhood US postal worker.

Ultimately, proper markings and vehicle lighting for your agency fall back to the responsibility of state and local laws or statutes.

Also, this is a statement for volunteer firefighters, using your private vehicle to respond to emergencies and especially while using a dash light is asking for it. Have an accident and see if your insurance company doesn't bale on you leaving you holding the bag for any damages, legal fees, and medical fees incurred as a result. A foolish move if you don't do your homework.

Also, it's a good idea to have blanket coverage on your personal car insurance to cover you in the event of an accident while operating emergency vehicles in case your agencies insurance leaves you in the cold. Just a thought.