Fuzzy concepts offer an endless source of fascination. Take the relatively new concept of running trails. Let’s not start in prehistory, but just go back half a century. when running – as a sport – could reasonably be classified into three kinds, by way of the ‘surfaces’ it is done on: track, road and cross-country.
Connecting interesting bits of townscape to each other into one uninterrupted walking and cycling area has a huge impact on usage. Take Shanghai’s Huangpu river quays. During my four years in this metropolis the city added dozens of kilometers to its landscaped, fully pedestrianized riverfronts and connected them by one unimpeded bicycle path.