Congestion is something we take for granted these days. So much so that we cannot now imagine a world without it. Even a casual glance will show us that we live overcrowded lives. Drowning in a thick soup of human beings, vehicles, buildings, gadgets, ideas, thoughts, emotions – you name it, we are hammered on a daily basis by an excess of it. Cities overflowing with humanity and their attendant excess and waste. Roads snarled to a standstill by motorists. Air, water and earth saturated with toxins.