The heaviest polluters are HGV which are already limited to 60mph on motorways, it will be a road safety nightmare having the usual two lanes of leapfrogging 60mph artics and cars that dare not go over 60 (which is likely to be actual 54mph)Aren't trials starting in Kent to have 80mph limits?
Road safety makes no difference - though in this case the claim is to reduce polution.
Aren't trials starting in Kent to have 80mph limits?

As it's a proposal that's been put out to consultation at this stage, perhaps objections to it would be better addressed to the Highways Agency than to some bunch of imaginary people on the Internet who can't do anything about it other than submit their own objections: https://www.gov.uk/government/uploa.../M1_J28_to_J35a_MSL_Consultation_Document.pdf
The heaviest polluters are HGV
which are already limited to 60mph on motorways, it will be a road safety nightmare having the usual two lanes of leapfrogging 60mph artics and cars that dare not go over 60 (which is likely to be actual 54mph)