Okay, imagine if you were playing a game of tag with your friends. If someone runs really fast, they can catch the person who is 'it' much more easily, right? Police cars are like those fast runners in the game of tag. They need to be super quick so they can help people when they're in trouble.
Police cars have special engines that make them faster than regular cars. This means they can drive quickly to places where someone needs help, like an accident or if someone is in danger. Just like how superheroes hurry to save the day!
Also, police cars have special lights and sirens that let other cars know they are coming. If you hear a police car's siren, it means they need to get somewhere really fast, just like the quickest runner in tag!
So, in short, police cars are built for speed so they can keep us safe and help people when we need it most!