Imagine you are playing with toy cars on a highway. You want to go from one road to another but there are lots of other cars around you. So, you wait for your turn and go one by one. This is like a regular interchange where you have to stop at a red light and wait for the other cars to move.
But free-flow interchange is a special type of highway junction where you don't have to stop for any light or any car. It is called free-flow interchange because it allows the cars to move freely from one road to another, just like a bird flying in the sky.
Free-flow interchanges are built in a way that the cars can move over and under the other roads without any conflict. This means that you can change your route without stopping or slowing down. It saves time, reduces traffic congestion, and makes your journey more comfortable.
Think of it like a game of cross-over where you can jump, slide or roll without any interruption. Free-flow interchange is like a cross-over game for cars where they can cross over to another road without any problem.