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Warning -- sharp curves ahead! This is a fascinating Priceonomics piece about the Steepest Streets in San Francisco, along with lots of infographics. Take a look. We wonder how the cars and trolleys stay glued to the roads!

The junction of Steep Street and Trenchard Street, Bristol, 1866. John Hill Morgan (b 1833), platinum print. This view was recorded five years before Steep Street, curving away to the left, was demolished and replaced by a realigned road, Colston Street. Steep Street existed in the medieval period when it was the main road from the centre of Bristol to Gloucester.

Lysevegen Road. Forsand, Norway The road is not small business. It has 32 sharp curves, a drop of 800 height metres on the last 8 kilometres (0.5 miles). The last 1.1 kilometer (0.7 miles) is driving through a steep 340 degree curved tunnel also with three switchbacks inside, called Lysetunnelen. This is the view 900 meters down, once you get on top. The highest point on the road is by Andersvatn lake, 950 metres above sea level. It is a long road, twisting and turning the whole way down.

Wonderful shot of a steep San Francisco hill // B&W // Fred Lyon

from Polyvore

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Untitled #2075 by xirix

While you may not know it by name, San Francisco’s Lombard Street is often touted as the “Crookedest Street in the World”. But Lombard Street wasn’t always that way. Back in the early 1900′s it was just another residential street in the San Francisco hills, with the one exception that it had a 27% grade, which made it all but impossible for most vehicles to climb.