People who want to bring motor vehicles to drive around while at Burning Man must get permission before they arrive. The group that gives permission is called the "Department of Mutant Vehicles”, or DMV. The cars, trucks, and buses must be changed to look very different from normal. These are called "Mutant vehicles". Mutant vehicles often have complicated lights. Some mutant vehicles have loudspeakers for playing music, and some have flames and other pyrotechnics.