We've Got You Surrounded

Our TV at home is stuck on CSI: CSI (the original set in Las Vegas), CSI Miami, CSI New York.

In these shows (and other cops 'n' robbers movies), they hone in on the criminal (or suspect), and cops come in mass numbers, driving up with their sirens. Let's say that the bad guy is holed up in a motel room, and the cop cars pull up around that motel room door. Usually, they're parked radially, all facing the door like rays from a sun.

Here's the thing: is there some kind of parking formation that real cops are supposed to follow? Like, a parking arrangement which allows them to get in hot pursuit quickly, in case the guy gives chase?

You know what I mean?

Because I can imagine that some methods of parking would cause them to be blocking each other when they all try to leave at the same time. Just wonderin'.