I think many of these posts are very helpful and gives very good advice to not cause accidents/roadrage on motorway (no-one wants that).
I think the best advice to give after reading some of these is that, everyone on the road is getting from a-b safely. Some may want to do it quick some may want to do it at their own pace. regardless of what speed your doing its best to be curtious and aware of other cars. It does not matter whos right or whos wrong, he cut me up blah blah blah.. at the end of the day, if anyone has an accident its bad for everyone, your family, yourself, other people on the road.
Keep left if not overtaking(or at least keep left if someone is overtaking you),
Be aware of your blind spots,
Give people and yourself space to overtake/react to what you or other people are doing,
Swift movements are generally unwanted,
LOOK ahead and pre-plan your exit stratagy if needed.
Just use common sense on the road as always, like Jeremy Clarkson said on Top Gear, i really dont understand how people use their brakes so frequenly on the motorway?? why??? Unless theres traffic you keep your distance you know when they're slowing down etc..!
Your on a road which has 3+ lanes.. your travelling in a relitively straight line as is everyone else.. its not hard to be curtious, its not hard to look ahead...
I remember a great saying that my instructor told me once i passed my test (1st time :P), before you pass your test you obay the laws to the nth degree, once you pass your test you avoid people idiot drivers on the road to the nth degree (and keep safe obviously). :)
HTH