Duke is installing sirens campus wide as part of an emergency response system in the wake of the VT shootings. carolina's system will be operational in March and State is getting one too.

http://www.newsobserver.com/news/cri...y/1092931.html

Overall, probably a good idea, especially since spoken messages can be broadcast over the system so those without text messaging capabilities (mostly campus visitors) would know what all the sirens are about.