Agree with both above, motorways are not complicated, lets face it, for one thing everybody is (usually) going the same way, biggest problem is a lot of people have no idea how to use their mirrors, relying on the interior mirror is no good on a busy motorway, you really do have to use all three mirrors as well as looking around you...you see far too many drivers staring straight ahead all the time.
My driving instructor when I did my HGV lessons said "if you are looking forwards all the time you will miss the accident you just caused"
Basically if you leave enough space all around you and are aware of all the other drivers you will stay safe and arrive stress free at the end of your journey, of course it helps if everybody does the same, sadly far too many drivers see any journey as a race :-(