The chime's on the siren are what the bell's at my school sound like.
Yep, the Westminster Chimes are commonly heard nowadays. My high school back in Spokane also had them on their bell system. My parents have a clock in their living room that also play the chimes.
Those loud chimes really startled me when I was trying to cover my ears from the loud noise while filming the siren pole. After the verbal message that played after the chimes, there was this guy who worked at a nearby motel, and he said to a child (whom I'm guessing was staying there) and then soon afterward to myself "That'll wake you up, won't it?"
I think you can hear him say that to the child (just barely) near the very end of this video clip.