Editing Holyhead (section)

====Road====
The post road built by [[Thomas Telford]] from London strengthened Holyhead's position as the port from which the [[Royal Mail]] was dispatched to and from Dublin on the [[Mail coach]]. The [[A5 road (Great Britain)|A5]] terminates at [[Admiralty Arch, Holyhead|Admiralty Arch]] (1822–24), which was designed by [[Thomas Harrison (architect)|Thomas Harrison]] to commemorate a visit by King [[George IV of the United Kingdom|George IV]] in 1821 ''en route'' to Ireland and marked the zenith of Irish Mail coach operations. Holy Island and Anglesey are separated by the [[Cymyran Strait]] which used to be crossed on the [[Four Mile Bridge]]; so called, because the bridge was {{convert|4|mi|km|0|round=0.5|abbr=off}} from Holyhead on the old [[Toll road|turnpike]].<ref name=fourmile/>