A limited-access road is like a special road where cars can only get on and off at certain places. It's kind of like a big, long tunnel or tube that the cars drive through without any stops or interruptions. The only way to get on or off the limited-access road is to use special entrances and exits that are built just for this road. This helps the traffic move faster and more efficiently without getting stuck in traffic lights, stop signs, or other obstacles. Think of it like a really fast and efficient way for cars to get to where they need to go without any interruptions or delays.