The 42, 4 and 4X routes travel along it, running between Holyhead and Bangor.
Some traffic leaves for major holiday destinations such as Caernarfon or the Llŷn Peninsula, though much continues on to the port of Holyhead.
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The road improvements have been part funded with European money, under the Trans-European Networks programme, as the route is designated part of Euroroute E22 (Holyhead - Leeds - Amsterdam - Hamburg - Malmoe - Riga - Moscow - Perm - Ekaterinburg - Ishim).
The line is also used by rail passengers changing at Dublin Connolly onto the DART to Dún Laoghaire for the Stena Line ferry to Holyhead, or travelling to Dublin Port for the Irish Ferries to Holyhead, and then by train along the North Wales Coast Line to London Euston and other destinations in England and Wales.
At first she was used on the Holyhead to Dublin North Wall service, then from 1908 on the Holyhead to Kingstown (later named Dún Laoghaire) service.
There are through trains from Manchester to Llandudno, but passengers travelling from London, Cardiff, or Holyhead to Llandudno usually have to change trains at Llandudno Junction.
The idea of the M54 was originally presented due to the high volumes of traffic on the A5, London to Holyhead road which was largely constructed by civil engineer Thomas Telford in the early 19th century following the route of the Roman Watling Street, which connected Rochester, Kent with Wroxeter, Shropshire.
Sited on the North Wales Coast Line from Chester to Holyhead, it was the location of experimental trackside water troughs, from which passing steam locomotives could scoop up fresh water supplies without having to stop.
Isle of Inishmore began her career on Irish Ferries' Dublin-Holyhead route as the flagship of the company's fleet, replacing the 1995 built Isle of Innisfree.
In 1992, she was chartered to B&I Line for use on their Irish Sea services and was renamed MS Isle Of Innisfree; Initially she served Pembroke Dock - Rosslare and later Holyhead - Dublin.
In 1965 there were 56 seabirds sailing regularly, mainly at Trearddur Bay (24 boats), Abersoch (21 boats), 6 boats at West Cheshire Sailing Club on the Mersey and single boats at Holyhead, Rhyl and Conway, although Cormorant, number 9, was being used as a fishing boat out of Liverpool docks.
The railway line from London and Birmingham to Holyhead was constructed through Shifnal at high-level in the late 1840s.
Within the month the service had been extended from London to Norwich, Nottingham, Liverpool and Manchester, and by the end of 1785 services to the following major towns and cities of England and Wales had also been linked: Leeds, Dover, Portsmouth, Poole, Exeter, Gloucester, Worcester, Holyhead and Carlisle.
The Welshman was a named passenger train of the London, Midland and Scottish Railway that ran from London Euston Station to Holyhead with portions for Llandudno, Pwllheli and Porthmadog.
On 26 April 1912, Hewitt successfully completed a flight between Holyhead and Dublin, landing in the Phoenix Park.
It led from Richborough in the south-east by way of a ford of the Thames at present-day Westminster to near Wroxeter, where one section went on to Holyhead and another, by way of Chester, on towards Scotland.