On average, 60% of the world's people and cargo is transported by vehicle
that move on rubber tires over roadways of various construction, composition,
and quality. The number of such vehicles, including automobiles and all
manner of trucks, increases continually with a growing positive impact on
accessibility and a growing negative impact on interactions among humans and
their relationship to the surrounding environment. This multiplicity of vehicles,
through their physical impact and their emissions, is responsible for, among
other negative results: waste of energy, pollution through emission of harmful
compounds, degradation of road surfaces, crowding of roads leading to waste
of time and increase of social stress, and decrease in safety and comfort.
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