Here's a question - why do people seem to think that it's okay to cut someone up when joining a dual carriage way? Just because they don't want to spend 5 seconds behind a lorry. And then when they cut you up, they insist on driving a 10mph below the speed limit.
And even after the event, they insist on lane hogging, right to the point that even the lorry was telling them to get over...
Someone who clearly needs more lessons stopping in live lane to merge right even though both lanes enter the motorway!