The UK Government is planning to trial 80 mph (129 km/h) speed limits on sections of the motorway network.
The Government announced a consultation on motorway speeds in September. At the time, then-Transport Secretary Philip Hammond said that the current limit of 70 mph was out of date and that the higher limit would give the economy a boost. The proposal was immediately criticized by environmental and safety campaigners who said it would lead to higher carbon emissions and more road accidents.
In a Parliamentary answer to a House of Lord’s Question last Autumn, Lord Shutt of Greetland said on behalf of the Government that CO2 emissions increase by around 14% for a vehicle driving at a steady 80 mph compared with a steady 70 mph.