Let’s assume we’re not stopped at a traffic signal.
This is only anecdotal, but I heard once that you’re not supposed to stop altogether, rather drive at a slower pace so as to let it pass quickly. The person said what was more important is that drivers don’t make sudden changes to their behavior. An EMT driver can more safely maneuver if they don’t have to predict what any one knucklehead will do the moment they get close.
If this is wrong or needs clarification, please enlighten me!
I’ve had some training in driving an emergency vehicle and I’ve been in the passenger’s seat a few times, so I know that the one thing the ambulance driver wants is predictability. Do whatever you can to safely get out of their way. Usually that means moving over to the side of the road and slowing down, but if it’s really slow traffic you might have to stop. Whatever you do, don’t stop while you’re in their way.
Tldr: stay calm and use your common sense.