In June, the Chicago Department of Transportation and Chicago Police Department created a video that demonstratively outlines the legal duties and responsibilities that bicyclists and motorists owe to one another on city streets. The video was created as a training aid for police and CDOT personnel. I've watched it, and it is an excellent resource for all people using Chicago's streets. Many bicycle accidents are caused by simple inattention. However, I suspect that many accidents are due to a lack of knowledge. How many motorists know that they must give bicyclists at least three feet of space, or that they must yield to cyclists when attempting to turn left? How many bicyclists realize that, unless they are under 12 years of age, it is illegal to ride on city sidewalks? Take notes.