USA - Twistiest pass over the Sierras, Hwy 108 to Sonora, CA

Turning off Hwy 395 heading west, the road to the summit is, in spots, one lane wide with many 10-15 mph turns. It's all paved and well maintained. Signs advise campers and trailers to not attempt the road. It's great fun and drops you at Sonora and Hwy 49.