in this particular instance, I saw the cop pulling out of the station and changed my route towards the nearest town border. As I approached, the blues came on. I don't have any mirrors on my bike so unless they blow the siren, I generally don't notice, but I'm guessing he thought I assumed I could just jump the border and must have radioed ahead. I pulled over and he didn't know what to make of my bike. The other two cops from the neighboring town didn't even come over to look at it - I'm guessing they didn't want to deal with me. After they left, I found out the cop was a buddy of a friend of mine and we chatted bikes for a bit, and he didn't care about the mirrors anymore.
;D
Lesson to be learned: Newbury is moto friendly (Georgetown is NOT)