One of the big problems we will face with post peak oil is maintaining roads, with oil and tar becoming rarer and more expensive, roads could just become abandoned due to cost and availability of materials. So even electric cars would not be able to drive around.
Here is a biological alternative to asphalt.
http://cleantechnica.com/2010/10/31/bacteria-can-build-better-roads-for-our-peak-oil-years/
http://cleantechnica.com/2010/10/31/bacteria-can-build-better-roads-for-our-peak-oil-years/
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