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I had to do a speed awareness course once and I remember the guy said that the middle lane is actually statistically the most dangerous lane to be in.
People just think its "slow lane > medium speed lane > fast lane" rather than "use leftmost lane unless overtaking".
Tbf I don't think you are required to do any motorway driving whatsoever prior to doing your driving test so many people simply don't know the rules
It's the lane where you have to pay least attention to the road