Wales

Snake Pass, Buttertubs, Hardknott, the Llanberis Pass, Gospel Pass and Porlock Hill — heights, gradients and the left-hand-traffic rules that catch visitors.

The A4086 over Pen-y-Pass, Nant Gwynant and Bwlch y Groes — the Eryri name change, Welsh 20 mph limits and single-track etiquette...