A(M): the other kind of motorwayOnly in the UK do we have a designation that's a hybrid of two other types, with a letter in brackets after the number. It is usually described as an A-road with motorway restrictions.
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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.
A1(M) is the designation given to a series of four separate motorway sections in England. Each section is an upgrade to a section of the A1, a major north–south road which connects London, the capital of England, with Edinburgh, the capital of Scotland.