Road roller

A road roller is a big machine with really heavy wheels that can flatten out dirt, gravel, and other bumpy materials so that they can be used to make roads or other flat surfaces. It's kind of like a giant rolling pin that helps make the ground smoother and easier to walk or drive on. The driver sits way up high in a little seat, so they can see everything and control the roller as it runs over the ground. It's very important for making sure our roads and other surfaces are safe and smooth to travel on!