Crime and safety levels can serve as potential barriers to outdoor physical activity. This project explored the relationship between actual crime and perceptions of crime in trail neighborhoods and trail use. Using data from local police records, neighborhood resident surveys, and infrared trail monitors, this study was able to add data of crime and disorder to a trail use model of an existing Active Living Research grant, Modeling Urban Greenway Use by Dr. Greg Lindsey. The goal of this project was to enhance the current trail use model and to better inform policy makers and practitioners on how crime-related issues affect trail use and physical activity levels.