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Ffordd Pen Llech
Ffordd Pen Llech ((:fɔrð pʰɛn ɬɛχ)) is a minor road in the town of Harlech which lies within Snowdonia National Park, North Wales. Its distinguishing feature is being the steepest signed public tarmacked road in the United Kingdom.〔(【引用サイトリンク】url=http://www.roadsuk.com/network/facts/ )〕
==Overview==
Ffordd Pen Llech is one of two roads surrounding Harlech Castle World Heritage Site, and linking the higher town centre with the Cambrian Line railway station, housing and camping areas close to sea level. Its descent of the rock spur to the north of the castle gives it a tangentially measured gradient at its steepest section of 1:2.73. Whilst this translates to the vertical rise being 36.63% of the horizontal going, it is normal practice for UK highway authorities to round gradients to a nominal figure to avoid confusing road users with excessive precision; hence the warning sign gives a slope of 40%. This sign was, in common with all earlier gradient warning signs in the United Kingdom, displayed as an arctan ratio of 1:2½, and subsequently changed to the new standard of the tangent expressed as a percentage.
The street is a single-track road for the majority of its length. To avoid problems with vehicles meeting on the slope and being unable to restart, the northern half has been made a one-way street for the main descent.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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