Motorcycles had a fatality rate of 212 per billion passenger miles, by far the highest of all modes: “A motorcyclist who traveled 15 miles every day for a year, had an astonishing 1 in 860 chance of dying — 29 times the risk for automobiles and light trucks.”
Through the emissions from combustion of fossil-derived fuels, transportation systems contribute to degraded air quality, as well as a changing climate. Transportation also leads to noise pollution, water pollution, and affects ecosystems through multiple direct and indirect interactions.