A study was conducted to examine environmental predictors of teenagers' alcohol-impaired driving, such as drinking location and alcohol source. By means of mixed model, logistic regression, relationships between drinking-driver status, alcohol source, drinking location, alcohol consumption, and individual demographics were predicted for the full sample of high school seniors who were drivers and consumed alcohol within the last 30 days as well as for males and females separately. Findings revealed that for both males and females, the risk of alcohol-impaired driving increased significantly with increases in both the number of binge-drinking events and estimates of the number of drinks needed to impair driving. Drinking location was found to be important as well, in that students who drank outside or in a moving vehicle were at significant risk of drinking-driving. Risks specific to women were number of drinking occasions and drinking at someone else's house. Implications of the findings for strategies to prevent drinking-driving are considered.