It is a familiar sight for any city dweller: the truck double parked or stopping traffic on a busy road to deliver some package at a house door. Commercial deliveries are an increasing congestion issue, particularly for European historical city centres.

Transport is the main source of greenhouse gas emissions and a serious contributor to global warming . Road vehicles in particular are responsible for a large proportion of urban air pollution.

Poor air quality costs Europe more than €700 million per year, in health expenditures and loss of economic performance, according to official EU sources.

Grass could be used to produce biofuels. The advantage of using grass crops is that they can be grown in marginal lands that would otherwise not be used .

Vehicles seats are normally made of polyurethane foam, a thick material that is expensive to recycle and ends up in dumping sites or being incinerated.