[hgomersall]

In the UK, hearing a siren is exceptionally rare. AFAICT, they overwhelmingly prefer lights only, saving sirens for a narrow set of circumstances.

[mcv]

Same in NL. Sirens are only turned on in the most extreme cases. In most cases lights seem to be enough. I do get the impression that firefighters are a bit more likely to use sirens than police and ambulance are, but I'm fine with that.

[0JzW]

this is absolutely not the case in Amsterdam. 90% of ambulances/firefighter cars have their sirens on full blast. this is especially noticeable in summer nights when they can be heard from quite far away

[Symbiote]

Except in London, where hearing a siren is so common people (other than drivers) don't react.