NORC meaning in General ?

The Silver State Classic Challenge is an authorized Open Road Racing event that is run since 1988 on a 90 mi (140 km) stretch of State Route 318 in Nevada, United States, which is closed for the occasion.

It is called the fastest road race in the world by Guinness, It was the venue for the highest speed achieved on a public highway, when Charles "Chuck" Shafer and Gary Bockman averaged 207.7801 mph (334.3897 km/h) in May 2000, in a Chrysler LeBaron ARCA race car. Although high-speed race cars receive much of the publicity, the majority of participants take part in mainstream street cars at average speeds ranging from 95 to 150 mph (153 to 241 km/h). These cars run the gamut from sports cars such as Corvettes and Mustangs to sedans such as Nissan Skylines, Mercedes wagons, and even Saturns.