From 'Walkable City' by Jeff Speck
In the vehicular cycling model, cyclists must constantly evaluate traffic, looking back, signalling, adjusting lateral position and speed, sometimes blocking a lane and sometimes yielding, always trying to fit into the “dance” that is traffic. Research shows that most people feel very unsafe engaging in this kind of dance, in which a single mistake could be fatal. Children as well as many women and elders are excluded. While some people, especially young men, may find the challenge stimulating, it is stressful and unpleasant for the vast majority. It is no wonder that the model of vehicular cycling, which the USA has followed de facto for the past forty years, has led to extremely low levels of bicycling use.