Exactly, I think they turn on their lights to scare the kid and try get them to wreck so that they win. I personally would like to see one of the cops start to lose then shoot out their opponents tires in mid-race just for the win . Just so you guys know, the cops do have other ways of catching you. A car is just a way of getting himself/herself to your location when you do the crime, it's also for intimidation and transportation for you.

*gets pulled over by cop* "sir do you know how fast you were going?" me: "Well why in the fuck would I have to tell you if you were REALLY clocking me?" cop: "relax sir, its just a speeding ticket..." me: "hey...? Aren't you a public servant? I mean, I pay your salary....go get me a glass of water"
-George Carlin