Okay kiddo, so a bus is like a big, long car that can carry lots of people at once. Sometimes, the road the bus is driving on can be very steep or twisty, which can make it hard for the driver to control the bus. If the driver isn't careful or if something goes wrong, the bus can fall off the road and down a really steep slope. This is what we call a "bus plunge". It's very dangerous and can hurt or even kill the people inside the bus. That's why it's important for everyone to be safe and pay attention when they're riding in a bus or even in a car. We always want to make sure everyone gets to their destination safely.