The A7 (Carlisle to Edinburgh) goes through more mountainous land. A motorway is not needed in the region, so it is not built. The A7 has been deemed an appropriate route for traffic that is needed to go from Carlisle to Edinburgh.
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When the M1 was upgraded to four lanes between the M25 and Luton, the M10 was killed off. Collector-distributor roads were built alongside the M1, and the A414 was routed on what was the M10, up the parallel carriageways alongside the M1 and off to join the next section of A414 at junction 8.
At 231 miles (370km), the M6 is the UK's longest motorway. It runs from Catthorpe (junction 19 on the M1) to the Scottish Border. The M62 is the highest motorway in the UK. It reaches 1,220ft (372m) near the Pennine Way footbridge.
Somewhere to the east of Glasgow lies the A8(M) - but look carefully, because it's not easy to find. The A8(M) is the UK's shortest motorway, running for just over 280 metres (308 yards). It forms a link between two roundabouts at Baillieston Interchange, better known as the junction between the M8 and M73.
The A1 also known as the Great North Road is the longest numbered road in the United Kingdom, at 410 miles (660 km). It connects London, the capital of England, with Edinburgh, the capital of Scotland.
There are two different “1” roads, the M1 is a motorway and the A1 is a dual carriageway. There are small sections of the A1 that have been upgraded to motorway standards. These stretches cannot be called M1 because that name is in use elsewhere, so they are called A1(M).