This is a list of roads designated A8:
The A8 in County Antrim, Northern Ireland is a principal route connecting Belfast and the harbour town of Larne. It is one of the busiest routes in the region and extends 26.1 km (16.2 miles) from Glengormley to Larne via Ballynure. The road forms part of European routes E01 and E18 although these are not signed.
The route is predominantly single carriageway, though it is dual carriageway in parts. At the southern end lies the mile-long A8(M) motorway, a spur of the M2 motorway. From this point the road is dual carriageway to Coleman's Corner near the townland of Lisnalinchey, where the B95 exits for Ballyclare. There are two climbing lanes; each on either side of the village of Ballynure, where the A57 joins. The Harbour Highway, bypassing Larne, is dual carriageway, and includes a grade-separated junction with the A2.
There have been calls for decades to have the route upgraded. The most recent upgrade is the section of dual carriageway as far north as Lisnalinchey. In 2007 the Government of the Republic of Ireland announced that it was willing to allocate a total of €580 million towards road projects in Northern Ireland to include the completion of the dual carriageway between Belfast and Larne.
The A8 is a major road in Scotland, connecting Edinburgh to Greenock via Glasgow. Its importance diminished following the construction of the M8 motorway which covers much of the route between Edinburgh and Glasgow (though with interruption).
The A8 begins at the West End of Edinburgh, in the New Town. The road originally also included Princes Street, but this stretch was declassified, as Princes Street is no longer open to all traffic.
The road continues westwards through into the suburbs of the city past affluent areas of Murrayfield and Corstorphine, often with an accompanying bus lane. Only once the road reaches the A720 City Bypass does it become a primary route, leading out past the Royal Highland Showground at Ingliston, and Edinburgh Airport.
At Newbridge, the A8 meets the start of the M8 and M9 motorways. From here the A8 is interrupted; it has been renumbered A89 until Bathgate, A7066 to Whitburn and then B7066 Harthill, until the A8 resumes at Newhouse — precisely where the eastern part of the M8 ends at its Junction 6.