Arrest them? That's a bit extreme isn't it? Surely a ticket or words of advice would be more appropriate?

That's a bit insulting towards our members of the emergency services isn't it? I imagine the driver was on an emergency call..... the sirens are to warn other drivers of the presence of the ambulance: at night people driver faster and more aggressively. It is important to warn other drivers of presence especially when you can't see them - like maybe around corners.

Or maybe we should stop ambulances making progress - and prohibit them from using their warning equipment. Let's just hope you don't need them in a hurry if you're having a heart attack.