The American Le Mans Series presented by Tequila Patrón (ALMS) is a sports car racing series based in the United States and Canada. It consists of a series of endurance and sprint races, and was created in the spirit of the 24 Hours of Le Mans. Teams compete in one of five current classes: P1, P2 & PC Le Mans Prototypes, and GT(E) & GTC Grand Touring cars. Race lengths vary from 2 hours to 12 hours.The American Le Mans’ Headquarters is in Braselton, Georgia, adjacent to Road Atlanta.
Quoted ALMS on Wikipedia: http://en.wikipedia.org/wiki/American_Le_Mans_Series