Garbage trucks are complex machines. Unlike typical trucks that simply haul goods, refuse trucks feature unique components that allow for on-demand trash compacting. A garbage truck starts with the basic parts you would expect from any commercial truck: the frame, engine, transmission, wheels, and other standard components. It also features a cab with room for the operator and other trash collection workers. More unique to this vehicle are the hopper and compactor. The hopper is the main component, where the garbage will be dumped. The compactor is a modern addition. This is a hydraulic system that works to crush and compact the refuse, allowing more trash to be hauled at once. Different styles of trash trucks also include components such as arms to lift dumpsters. Most refuse trucks provide controls that operate the arms and compactor from both inside and outside the cab.