Another possible effect would derive from transportation and housing infrastructure. Millions of people live in suburbs, a type of low-density settlement designed with the car in mind. Some commentators such as Kunstler argue that because of its reliance on vehicles, the suburb is an unsustainable living arrangement; the implications of peak oil would leave many unable to afford fuel for their cars, and force them to move to higher density, more walkable areas. In Europe the usual belief is that mass transit, such as light railways or trolley buses run by electricity created by non-fossil fuels such as nuclear power will be the answer. As automobiles can be run on biofuels, such as ethanol, methanol or vegetable oil without modifications, many European countries are already on their way on conversion into biofuels instead of petroleum. Others argue that if the supermarket delivers to its customers (who order through the internet) it will use considerably less petrol than if all the cars drive to the supermarket, and home deliveries are already common practice in many first world supermarket chains.

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