"Here is a sobering thought: it is estimated that there are more than 750m vehicles on the planet, and that this mechanical population is swelling by more than 50m newcomers each year. At the current rate, the total number of cars on the road will double by 2025. All those vehicles need to go somewhere—but, increasingly, they don't. While the combustion engine brings movement to the masses, and gives us the freedom of choice to live and work where we want, it also regularly leaves us gridlocked, sitting impotent and immobile in traffic jams, gently simmering in our own frustration."