Motocross (MX) Racing

Motocross MX or MotoX, The name "motocross" is a portmanteau derived from the words "Motorcycle" and "Cross Country". Motocross is distinct from other forms of motorsport in having a mass start, where all the riders line up alongside each other, starting simultaneously and racing the race distance.
The first rider across the finish is the winner of that "moto"; the number of motos may vary and points are added up to determine the final winner.
Motos vary in duration, measured in time elapsed plus one or two laps, or alternatively a fixed number of laps. Top level racing tends to have long races (e.g. 30 minutes plus 2 laps) while at the other end of the spectrum, amateur races can be as short as 5 minutes. When the designated time duration of the race is complete, a finish line flagger signals via a board or flag to the racers that there are one or two laps left, and the race is finished by a checkered flag.
Motocross tracks are often quite large (a mile or more) and incorporate natural terrain features with varying amounts of man-made jumps and other features. It is not unheard of for a Motocross track to be made up entirely of hills and turns with a few jumps. In contrast, Supercross is an entirely man-made track, comprised almost exclusively of a wide array of jumps, and is typically held in an large stadium or arena. Due to the size of outdoor tracks, motocross races typically include 40 racers, while supercross races usually have about 20 in the main events.
Contrasting with motocross are the off-road racing events of Enduro, Hare and Hounds, Hare Scrambles, et cetera. In these events there are a pre-determined number of laps or long distance loops to complete within a maximum time limit. These events, unlike Motocross, race on courses that are largely comprised of natural terrain. The Baja 1000 is an example of one of these types of events.