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The European Parliament's Committee on Transport and Tourism commissioned a report on the impact of overtaking bans for heavy goods vehicles which was published in 2010 (downloadable here). It makes interesting reading, and concludes that "annual benefits of up to 1500 million euro could be realised by introducing such schemes at optimal locations" across EU countries.If you add up the cost to the atmosphere in CO2 emissions for the lorry overtaking due to no slipstream & the cost of cars having to brake, decelerate then accelerate it seems the hidden underlying impact is quite substantial & not worth the gain to the overtaking lorry. This is without the risk involved in performing this manoeuvre. Doesn't seem worth it to me.
Actually, the formation of informal "road trains", or "platoons" of HGV's is one of the negatives that the linked report identifies. The particular problems are that they effectively restrict access to junctions for both vehicles wishing to leave and those wishing to join the main carriageway. They also result in road signs being obscured, and there is at least one scheme that was proposed in the UK that was abandoned for exactly those reasons.Road trains for all vehicles (cars included) on M-ways seems the only logical way forward.