Road roller (sometimes called a roller-compactor, or just roller) is a compactor type engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of roads and foundations, similar rollers are used also at landfills or in agriculture.
The road roller may seem like a modern piece of equipment, but it has been around for centuries. Although it was first used under horse power, the horses were eventually replaced with steam power in 1860. By the 1900s, the steam-powered roller was replaced by rollers that were powered by other sources, such as diesel.
Take a look near the Gandy Bridge and you may see one of these important machines.