Whilst the initiative is good, in practice the real impact will be upon those who need a car due to location or health reasons. So their merge mileage will be just as impacted per mile as those who do excess mileage and gets down to those that can pay, pay for it.<p>Equally this takes into no account, how heavy the vechile is, or indeed how impacting enviromentally it is. It add's no incentive at all, and equally, a light small efficient vehicle will be less impacting upon road upkeep than a heavy HGV.<p>Now - what I feel is needed is a quota system in which you get a mileage quota and if you go over that, you pay per extra mile.<p>What are the impacts beyond this - well, this does lay down the foundation to make roads in effect virtual toll-roads and that may well for good or bad, may well incentive private roads now a consumer base has been more conditioned to paying for usage of a road.