[ndsipa_pomu]

To be fair, most of the gridlocked traffic is caused by drivers not understanding that they shouldn't enter a yellow box junction until their exit is clear and similarly, they shouldn't be nosing out onto a roundabout when their lane is already full - that's what tends to cause the issues.

[DrBazza]

True. It's in the Highway Code. Then again, so is 'move quickly past the vehicle you are overtaking, once you have started to overtake. Allow plenty of room. Move back to the left as soon as you can but do not cut in'. But you wouldn't know it driving on UK motorways.

[ndsipa_pomu]

There's a special ring of hell reserved for drivers that stay in the middle lane.