From the first foot migration out of Africa to the Model T Ford, hot air
balloons, submarines, rickshaws, and moon rockets, humans have combined
imagination, daring, and scientific and technical knowledge to improve
existing vehicles or create new ones. Geography, culture, and available
technologies have all influenced the development and use of vehicles in
different parts of the world, and human travel has, in turn, often had a
profound influence on society and the environment.