I've often struggled to put into words my utter frustration at the urban planner's obsession with building right-angles into every single piece of walking and cycling infrastructure possible. This diagram by my friend over at Copenhagenzine illustrates it perfectly;
A Short History of Traffic Engineering by Mikael Colville-Andersen, on Flickr
It also captures that the cycle/foot path only being as good as what it's connected to.