The American Le Mans Series (ALMS) offers fans around the world gripping racing with fascinating sports prototypes and sports cars. Highlights on the calendar are the long distance classics like the Sebring 12 Hours and Petit Le Mans in Road Atlanta. The regulations correspond to those of the Le Mans 24 hour race.

All race cars start together but are classified separately. This ensures racing that is exciting and constantly changing. Points are awarded only for placings in each class.

At each race and in each class points are awarded for the 10 best-placed drivers, teams, manufacturers (chassis and engine) and tyre supplier according to the following scheme:

Races under 4 hours:
20-16-13-10-8-6-4-3-2-1

Races between 4 and 8 hours:
25-21-18-15-13-11-9-8-7-6

Races over 8 hours:
30-26-23-20-18-16-14-13-12-11

The champion is announced for every class.

Created in 1999, the race series is the world leader in "green racing". All teams with petrol-powered vehicles must refuel with petrol containing at least 10 percent of bioethanol.

Like previous year, Porsche works drivers Joerg Bergmeister and Patrick Long clinched the highly competitive GT2 class title with the Porsche 911 GT3 RSR in 2010. The 911 GT3 RSR was not only the most successful racer in the USA, but also by far the most efficient GT vehicle of the year. With the sports car from Weissach, Porsche also secured overall victory in the environmental Michelin Green X Challenge.

One of the many highlights of the past 2010 season was the race premiere of the Porsche 911 GT3 R Hybrid in the USA, which received huge public interest. The sports car with ground-breaking drive technology and the Le Mans winners Timo Bernhard, Romain Dumas and Mike Rockenfeller at the wheel again demonstrated its reliability, performance and efficiency. Competing in the unclassified GTH class for experimental cars, it conquered the 1,000 miles on this difficult circuit without any technical problems. For the Porsche engineers, this test outing yielded many crucial insights in order to further perfect the innovative hybrid drive for upcoming races.

In the American Le Mans Series, sports prototypes and sports cars compete in five different classes, that start together but are classified separately. At the season-opener in Sebring and the season finale Petit Le Mans at Road Atlanta, the field is divided into six classes:

This most popular class amongst car manufacturers is traditionally very well supported: Slightly modified standard sports cars with 440 to 460 hp and a minimum weight of 1,125 – 1,325 kilograms (e.g. Porsche 911 GT3 RSR).

Like the GT class, but the regulations require that each vehicle must have one professional driver at the most (Intercontinental Le Mans Cup: 12h Sebring u. Petit Le Mans at Road Atlanta).