M are motorways,the fastest roads,mostly between cities. A are most main routes. B are minor roads. Scotland Hotels and Places to Stay. See All.
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M routes are primary traffic routes, called motorways in some states. These are typically dual carriageway, freeway-standard highways, but may also be used for rural roads that are nearly at freeway-standard, or at least are dual carriageways.
How the M25 got its name. The same principle explains the M25, which at its oldest point (the section crossing Surrey) follows the path of the older A25. These roads are all in the South East, which forms Zone 2 of the country's motorway system. This explains why they all contain 2 somewhere in their name.
Answer: A motorway just relates to the A road that it's relieving pressure from. The reason there is no M7 is that the A7, which runs from Carlisle to Edinburgh has no need for a motorway to relieve it.
In the United States, there are more than 30,000 deaths due to motor vehicle collisions every single year. In Britain, on the other hand, fewer than 2,000 people lose their lives in motor vehicle crashes annually. This significant discrepancy in death rates can be explained, in part, by differences in population.