Okay, so you know when you're playing with your toy cars and there are two roads that meet each other, but they're at the same height? That's called a level junction! It's like a crossroads but without any bridges or tunnels.
Imagine you and your friend both want to go to the same toy store, but one of you is driving on one road and the other is driving on the other road. When you both get to the level junction, you have to be careful and watch out for each other. You might have to stop and wait for the other person to go first so you don't crash into each other.
Level junctions are important because they help people get where they need to go safely. It's like a big puzzle where all the roads have to fit together in just the right way. So next time you're playing with your toy cars, remember the level junction and how important it is to be careful and look both ways before crossing!