Whether or not an individual chooses to bicycle depends on circumstances such as the quality of bicycle infrastructure and characteristics of the surrounding environment, as well as their own comfort with and preferences for bicycling. People around the world have adopted or rejected bicycling based on factors such as how much they like bicycling, how stressful they find car traffic, who else in the community bicycles, and their need to transport children or carry groceries. In these papers, researchers explore how and why people bicycle in Davis and beyond as they analyze the circumstances that influence bicycling behavior.