Could someone define this for a poor confused American?

(okay, no pot shots at that comment)

I saw it in the journal post forum.

Blues and two's simply mean blue flashing light & two tone siren...

Yup exactly, but its used even though the two-tone sirens aren't as common anymore, and the 'twos' is used to describe any siren really.

Ah. Much obliged for the clarification!

Also a tv show about emergency services.

Nice. Blues and Twos. In the states, some agencies say they're "running code" and some, like my agency, say we're "Priorty 2" or "Priority 1". Priority 1 is very rare.

But tonight, when I get to run priority, I'll be sure to explain it (not on the radio) but to my coworkers that I ran Blues and Twos.

I like it... I hope it catches on over here.

Our radio lingo for blues and twos is a code 3 call which is also common in the states