The world gets around on two wheels. No, seriously, for much of the world's population, two-wheeled transportation is the dominant method of travel, as countries like India, Japan, China, and the countries around the Gulf all rely on them more than they do on cars, trucks, and SUVs.
It's why whenever you see a travel show anywhere outside of America and Europe, motorcycles, scooters, and other two-wheeled machines dominate the landscape. The world revolves around motorcycles, which is how I like it.