The A11 isn't a motorway, it's just an ordinary road and runs between London and Norwich. The M11 motorway runs between London and Cambridge.
cathedrals and their stained glass windows in particular
Motorway signs in England have a blue background.
The M1 or M6 motorway's traveling North-South.
The M42 motorway is a major road in England. The motorway is 55 miles in length and spans Bromsgrove in Worcestershire to Ashby-de-la-Zouch in Leicestershire.
The M6 is the longest motorway in England, stretching 226.7 miles from Rugby in the Midlands through the north-west of England to Gretna on the Scottish border.
The M25 is a major motorway that encircles Greater London, England. It is known as the London Orbital.
Spaghetti Junction just north of Birmingham.
The M62 Motorway is located in northern England. It offers access to Liverpool, Salford, Manchester, Bradford, Leeds, Wakefield, and Hull. It is 107 miles long.
You haven't specified which country you are referring to. As this question has appeared in the 'England' category, I can say that all UK motorway signs are in the colour blue.
If a11 = 12 then a43 = a11 + 32*d = 12 + 32*(-6) = -180.
The M2 Motorway in Kent, England, is only 25.7 miles long (41.4km). It is extended by the A2 dual carriageway at either end which makes the road longer.
The M6 motorway is the main conduit between England's second city (Birmingham) and the heavily populated north-west of England including the cities of Liverpool and Manchester as well as the only major route for road freight between England and Scotland. This very heavy traffic is further constrained by a mostly 3-lane motorway which has frequent junctions that contribute to accidents which cause all too frequent delays.