This is bad practice and causes inconvenience and tailbacks and annoys other users. There are two types of motorway, rural and urban. You need to think of them as quiet and busy. Quiet motorways are boring, so you need to concentrate on the road and traffic conditions way ahead. Busy motorways need your attention all around you rather than just focused ahead.
Motorways are like dual carriageways only safer.
They are safer because every motorway user is travelling in the same direction and at similar speeds. Motorways are also safer because there are no sharp bends, no oncoming traffic, no right turn, and no roundabouts. The lanes are always wide, and well marked, and are usually straight for long distances. Remember you are not allowed to reverse, cross the central reservation, or to drive in the wrong direction on motorways. Care needs to be taken to make sure you know the various signals and what they mean.