Here is a link to an interesting article on Flashing Blue lights....

[link to www.washingtonpost.com (secure)]

Not sure it really relates to why there were flashing blue lights in this interview clip but some interesting quotes from the article:

“We call them solar mobile surveillance camera systems,” said Chris Rhoades, director of accounts at Maryland Security Professionals, the Annapolis-based company that has deployed 17 of the units along the 16-mile Purple Line light-rail line.

Attention is exactly what they want to garner. Forget hidden cameras. These cameras trumpet their presence to the world.

showing those people in the criminal element that they are being watched 24/7.” :)

Or maybe it's Morse code?