You will never find it on a map or a guide book but 20th & Vermont Street makes Lombard Street look straight.
No Japanese tourists but your backseat passengers might get sick if you go too fast.
Potero Hill
Vermont Street and 20th.
Look for the sign that looks like a snake and a street that disappears straight down
Updates
The Vermont & 20th switchback is covered in Adah Bakalinsky's walking guidebook "Stairway Walks in San Francisco."
Send your feedback or queries to been.there@guardian.co.uk
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