There are many examples of two roads meeting each other again and again. The longest Motorway wholly in Scotland is the M8 at 61 miles, with the M74 coming second at 32.5 miles. classified roads in the British Isles. Most are urban link roads, which were allocated separate numbers many years ago, whereas these days they would simply be a spur of the main route.

However, none of the A-roads are continuous as they either have a non-dominant multiplex, or motorway (eg There must be many claimants for the title of shortest classified road in GB. Linking Lo… This page is still a 'work in progress' and updates / corrections are more than welcome. If the two routes multiplex with each other, both junctions are counted. Communities along the M6 include Stoke-on-Trent, Birmingham, Manchester, Preston, Lancaster and Carlisle. At 273 miles (439 km), it is the longest road in Scotland and the fifth-longest A-road in the United Kingdom. The longest motorway in the UK is the M6. Stretching almost 400 miles, the road has a number of different personalities as it travels north through the UK, from urban carriageway to rural motorway and back again.
References to 'Great Britain' below exclude Northern Ireland, which is treated separately. Duke Street is a street in Glasgow, Scotland.

The longest motorway in Ireland is, for now, the M7 at a distance of 187 km (116 miles). In the south the road's importance has been eclipsed by:

The longest road in the UK is the A1, also known as the Great North Road, which runs from Central London in the south to Central Edinburgh in the north. At 185 miles (300km) and running from Cardiff in the south to Llandudno in the north, the A470 is the longest road in Wales and an important link through the country. Historically it was the main road between Edinburgh and John o' Groats, and has been called the spine of Scotland. The original route of the designated A9 began in The most significant alteration of the A9 route was the realignment of the route north from Inverness, crossing the In November 2011 the Scottish Government announced that it would upgrade the entire road from Perth to Inverness to dual carriageway.In July 2013, the Scottish Government announced a plan to install The original starting section of the A9 between Edinburgh and Polmont no longer exists as such, having been reclassified over the years in a variety of ways; indeed part of the original route between Kirkliston and Maybury no longer exists at all as the area is now part of Edinburgh Airport.The section between Perth and Inverness is often cited as being the most dangerous section of the road, and regularly appears in lists of Scotland's most dangerous roads.The section from Keir Roundabout to Inverness had average speed cameras installed in 2014 and at the same time the single carriageway speed limit for In the north, beyond Inverness, the A9 designation has been transferred in response to construction of new bridges across the Towns and villages which were on the A9 but now quite remote from it:

The link between the M9 and the A9, by Bridge of Allan, is the Keir Roundabout. The A9 is a major road running from the Falkirk council area in central Scotland to Scrabster Harbour, Thurso in the far north, via Stirling, Bridge of Allan, Perth and Inverness. Construction began in 1733 to a design by The formal scheme of classification of roads in Great Britain (England, Scotland, and Wales) was first published on 1 April 1923. Between Edinburgh and Falkirk the old A9 route has been reclassified into the A803 and the B9080 amongst others; part of the route between Kirkliston and Maybury no longer exists as the area is now part of Edinburgh Airport. The longest motorway in Northern Ireland is the M1 at 38 miles.

Generally they result from a main route being realigned, and the old road being downgraded to a lesser status. Its total length is 232.2 miles, or 373.7 kilometres. The A1 is the longest numbered or classified road in the United Kingdom. SABRE - The Society for All British and Irish Road EnthusiastsGeographical extremities: north, south, east and westGeographical extremities: north, south, east and west Between Falkirk and Bridge of Allan, the A9 survives as a more or less parallel road to the M9.

It takes its name from the Duke of Montrose. It runs from the city centre to the East End, from High Street through the residential district of Dennistoun, past The Forge Shopping Centre, meeting the Gallowgate, Tollcross Road and Westmuir Street to form a turreted Edwardian junction at Parkhead Cross.

The M6 first opened in 1958 and was completed in 2008. However, Wade had still to bridge the River Tay at Aberfeldy. Running from Junction 19 of the M1 near Rugby to Gretna and the A74(M) near Scotland, the M6 is also one of the UK's busiest routes.

Some examples are: This page is an attempt to provide details of the longest, highest, etc.