As if the usa is the only country in the world with congested rush hour traffic. I've been in streets that were way more tightly packed + chaotic than this and people would still clear a path for vehicles with sirens. The emergency vehicle would only be able to go 20 to 30 kmh without a motorcycle escort, but that's still significantly faster than what we're seeing here.

What we're seeing in this video, is that (some) vehicles that are directly in front of the ambulance move out of the way, but vehicles that are a tiny bit further ahead, don't even try. If a vehicle that is directly in front of the ambulance can move out of the way, then a vehicle that is 30 places ahead, is also able to move out of the way, but they don't even try ... What should happen is that as soon as drivers hear a siren, they should start looking for where it's coming from and then clear a path, and drivers should also especially not be driving into the path that others are clearing. Instead it seems like these drivers wait till the siren is right behind them and only then some start to move out of the way.

Looking for excuses in American exceptionalism reads like a case of "we've tried nothing and we're all out of ideas". This particular problem is something that can be easily improved upon by a public awareness campaign and some light fines for those that keep obstructing after the campaign has been running for some time. But what's obviously even easier than that, is finding an excuse to continue doing nothing about the problem.