Vehicle crashes have resulted in 474 traffic fatalities in the Delaware Valley region per average year between 2005 and 2007. In 2008, 379 people lost their lives in traffic crashes in the nine-county region, a decrease of 30 percent over 2008. While this trend is encouraging, the numbers are still too high. This report details what a crash data user should know, with a focus on New Jersey and Pennsylvania. Terms are defined, the differences between the states are explored, and the various ways in which the data is used are discussed, including DVRPC's programs. The final chapter -- Future Directions in Crash Data Management -- highlights technological advancements in analysis designed to make data manipulation easier, and the results more reliable.