SONOMA, CA:  Infineon Raceway, formerly Sears Point Raceway, is a 2.52 miles (4.06 km) road course and drag strip located on the landform known as Sears Point in the southern Sonoma Mountains near Sonoma, California, USA. The course is a complex series of twists and turns that go up and down the hills. It is host to one of only four national NASCAR races each year that are run on road courses (including two races at Watkins Glen International in Watkins Glen, New York and the Nationwide Series-only races at Circuit Gilles Villeneuve in Montreal, Quebec, Canada). It is also host to the Indy Racing League, Grand-Am Rolex Sports Car Series and several other auto races and motorcycle races such as the American Federation of Motorcyclists series. Infineon Raceway continues to host amateur, or club racing events which may or may not be open to the general public. The largest such car club is the Sports Car Club of America.