There are 37.9 million licensed vehicles on our roads (DfT figures to end of March 2018), comprising 31.3m cars, 3.9m LGVs, 1.2m motorbikes, 500,000 HGVs and 900,000 ’other’ vehicles. Of the cars, 52% are petrol and 45% diesel. However, when you take into account the LGVs, HGVs and buses, diesel ...