M roads: motorways. These are the fastest roads (when there is not much traffic). They have blue signs. Examples are the M25, M1 and M4.
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There is no M7 because there has never been a need to replace the A7 with a motorway. There was an idea in the 1990s to build a new toll road linking Edinburgh and the A74 (M), along the lines of the A702, and the idea was floated that this could take the M7 number.
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.
You'll often see the word 'rappel' underneath speed limit signs in France. It translates as 'reminder' and its purpose is to remind you that speed restrictions are still in place, so you need to stick to the specified limit.
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.
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.