Given that my photo was the inspiration for the start of this thread, a long time ago, I guess it behooves me to keep it going.
This photo shows the paved access road that starts at the end of Big Rock Drive, in Malibu, California, well above the Pacific Ocean. The pavement leads onto dirt roads in the Santa Monica Mountains Recreation Area. At the start it looks like an easy ride. However, the pavement soon reaches rock strewn grades of more than 20%.