Here is an article on the progress in Minneapolis from the Atlantic has made in increasing bicycle commuters and reducing crashes. A couple of take aways are that how you design the system matters and despite complaints of cyclist behavior, motorists actually contribute to more crashes.
A general need to improve urban bike infrastructure has become increasingly evident. As Emily Badger recently reported, dedicated bikes lanes cut bike-related injuries in half, and protected lanes drop the risk by 90 percent. In its master plan, Minneapolis intends to add 183 miles of bikeway in the coming years, and to bring all residents within a half mile of a bike lane by 2020.
Bicyclists played a role in 59 percent of recorded bike/car collisions: the most common problems being a failure to yield (13 percent) and disregarding a traffic signal (13 percent). Drivers, meanwhile, contributed to 64 percent of accidents, most commonly (32 percent) through a failure to yield themselves. (The figures exceed 100 percent because each party can have some blame in a collision.)