As I said, I really don’t want to get drawn into the environmental debate, but there is one persistent myth that does need to be corrected: the idea that emissions from “heavy” vehicles are not priced. They are. They’re in the ETS. Reductions in heavy vehicle use due to tax will not reduce carbon emissions at all, as it will be emitted elsewhere in the economy. The only way to reduce the emissions of an activity covered by the ETS is to lower the cap, which can be done without a vehicle tax of any kind.