40% The "steep hill" sign at the top of Ffordd Pen Llech, the steepest tarmacked road in the UK (see 3284561 for wider view). The sign shows 40% or 1 in 2.5, although apparently the steepest part is actually slightly shallower at 1 in 2.91. Whichever is the case, that is steep! It's not surprising that it is shown as unsuitable for motors (and probably not really suitable for anything else either). For a photo of the steepest point, see 105618.
'''40%''' The "steep hill" sign at the top of Ffordd Pen Llech, the steepest tarmacked road in the UK (see 3284561 for wider view). The sign shows 40% or 1 in 2.5, although apparently the steepest part is actually slightly shallower ...
