The common transport policy is like a set of rules that everyone agrees to follow when they are traveling from one place to another. Imagine you and your friends all agree that you will ride your bikes on the sidewalk and not on the road. This is like everyone in Europe agreeing to follow certain rules when they travel between different countries.
One of the most important rules in the common transport policy is that everyone has to be safe when they are traveling. This means that people have to wear helmets when they ride bikes or drive motorcycles, and that cars have to be in good condition and have working brakes and lights.
Another rule is that people have to be able to get from one place to another easily, no matter where they are in Europe. This means that there are trains and buses that can take people from one country to another, and that airports are set up to make it easy to travel by airplane.
The common transport policy also helps make sure that the environment is protected. This means that people who are traveling have to be careful not to pollute too much (like by using cars that release too much pollution), and that there are rules in place to protect animals and plants that live near roads and highways.
Overall, the common transport policy is like a big agreement that everybody in Europe follows to make sure that traveling is safe, easy, and good for the environment.