[1] Multi-arched examples sometimes have triangular cutwaters that are extended upward to form pedestrian refuges.
[2]: 24–25 Packhorse bridges were often built on the trade routes (often called packhorse routes) that formed major transport arteries across Europe and Great Britain until the coming of the turnpike roads and canals in the 18th century.
[1] Before the road-building efforts of Napoleon, all crossings of the Alps were on packhorse trails.
[3] Travellers' carriages were dismantled and transported over the mountain passes by ponies and mule trains.
[4] The following list includes all listed buildings described as packhorse bridges by English Heritage, Cadw, or Historic Scotland; all 106 of Hinchliffe's Group 1 bridges in England; and certain other candidates.