This spectacular cliffside road climbs up 800 feet in just six-tenths of a mile. The average grade is 25%, but it has long sections measuring 30%. Some parts reach 37% and some people claim as high as 45%. It's a paved public road, but it is not a residential street and is only open to 4 wheel drive vehicles and people on foot. Engines have been known to stall on the way up and destroy brakes on the way down. If you are brave enough to slog up it, you'll benefit from the exercise and enjoy the stunning scenery.