A slot car or slotcar is a powered miniature auto or other vehicle that is guided by a groove or slot in the track on which it runs. A pin or blade extends from the bottom of the car into the slot. Though some slot cars are used to model highway traffic on scenic layouts, the great majority are used in the competitive hobby of slot car racing or slot racing. Description Slot cars are usually models of actual automobiles, though some have bodies purpose-designed for miniature racing. Most enthusiasts use commercially available slot cars (often modified for better performance), others motorize static models, and some "scratch-build", creating their own mechanisms and bodies from basic parts and materials. Drivers generally use a hand-held controller to regulate a low-voltage electric motor hidden within the car. Traditionally, each car runs on a separate lane with its own guide-slot (though recently developed digital technology can allow cars to share and change lanes). The challenge in racing slot cars comes in taking curves and other obstacles as fast as possible without causing the car to lose its grip and spin sideways, or to 'deslot', leaving the track altogether. Some enthusiasts, much as in model railroading, build elaborate tracks, sculpted to have the appearance of a real-life racecourse, including miniature buildings, trees and people. Hobbyists whose main goal is competition often prefer a track unobstructed by scenery. Model motorcycles, trucks and other vehicles that use the guide-slot system are also generally included under the loose classification of "slot car." How it works The diagram on the right shows the wiring of a typical 1:24 or 1:32 slot car setup. Power for the car's motor is carried by metal strips next to the slot, and is picked up by contacts alongside the guide flag (a swiveling blade) under the front of the slot car. The voltage is varied by a resistor in the hand controller. This is a basic circuit, and optional features such as braking elements or electronic control devices are not shown. Likewise, the car's frame or chassis has been omitted for clarity. HO slot cars work on a similar principle, but the current is carried by thin metal rails that project barely above the track surface and are set farther out from the slot. The car's electrical contacts, called "pickup shoes", are generally fixed directly to the chassis, and a round guide pin