You don't have to check your rear-view mirror to know the cop is still on your tail. The siren is enough of an indicator. This isn't your first high-speed pursuit. In fact, you can tell how close he is by the volume of the siren as it bounces off of store fronts, mailboxes and other vehicles. And here's the worst part: you were winning that street race until the cops showed up and ruined everything. You throw a quick shift and floor the accelerator, making the tires squeak and burying the needle on the tachometer. You dart between two SUVs and hang a quick left, then another. The siren fades. After it disappears all together, you breathe a sigh of relief and think about your next race.