What is the steepest incline in the world?

Having once boasted a record 37.5% gradient, Ffordd Pen Llech in Harlech, Wales has since been downgraded to an official 28.6% gradient following an appeal. The winding Welsh street is a public road and historic landmark that partly surrounds Harlech Castle. Google Street View.



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It doesn't matter exactly what it means, 20% is steeper than 10%. In surveying 20% is interpreted as 20% of a right angle (i.e. a brick wall) and so would be 18 degrees.

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Hardknott Pass is considered to be one of the most challenging in the UK. It has earned this consideration due to its series of hairpin bends and the high risk of ice on the road. It is a steep, twisting, single-track road that cuts right through the heart of the Lake District between the Duddon Valley and Eskdale.

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It features narrow parts and two 180 degree switch backs. At 25%, Porlock Hill is reputably the steepest A road in England. It's located west of the village of Porlock in Somerset. It climbs approximately 1,300 ft (400 m) in less than 2 miles (3.2 km) up onto Exmoor.

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Ffordd Pen Llech, a winding street through the historic part of town, has a gradient of 37.45%. Resident Myrddyn Phillips, who took the measurements that led to the world title, said: “To have the steepest street in the world, recognized by Guinness World Records, is brilliant for Harlech, it's brilliant for Wales.”

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The A836 passes through some of the loneliest and most sparsely populated parts of Britain, and despite having an 'A' classification, is a single track road in many places.

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By spring, the road surface can have holes (called 'potholes') where the surface has broken. Another cause is heavy lorries driving on roads not built for such large vehicles. They gradually damage the surface and can even make the road lumpy. Potholes aren't just bad for your car, they can also be dangerous.

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