Yeah that’s usually at an intersection where the only place to go to is into a red light with crossing traffic. A quick search of laws in the US shows no relief for motorists just because there’s a fire truck behind you trying to get through. If you run the red light to make way you could be ticketed (even though it would be real asshole to issue the ticket), and if someone hits you while you run the red or move into tbe intersection to make way it’s your fault. So there’s a lot of disincentive to move in those cases. Where I live people all move over if they can. Otherwise they stay put to be predictable and let the emergency vehicle use the breakdown lane or oncoming traffic. Worst thing is when people cluelessly start randomly trying to outsmart the ambulance and cause a clusterfuck of cars that nobody can get past. US drivers have fuckall for discipline.