Mr. Leno says that every major city must have a great race track hidden in it somewhere. He thinks the best car movie ever made is Claude Lelouch’s C’etait un Rendez-Vous. Inspired by this 70s short car movie he comes up with LA’s hidden circuit, which starts from Mulholland east and goes to Laurel Canyon, then south to Sunset Boulevard west to Coldwater Canyon north, and back to Mulholland. To give you a better idea take a look at the google maps.
This hidden circuit is about 10.7 miles long and Google estimates it should take about 24 minutes to lap in daily traffic.