This is the time of year when Pennsylvania drivers are at the greatest risk of being involved in a deer-related crash. With deer being more active during breeding season October through December is the time of year when Pennsylvania drivers are most likely to be involved in a deer related crash. As a result drivers are urged to slow down and pay attention. State Insurance Department spokesman Ron Ruman says deer-related crashes were up last year. Under state law a crash in which a vehicle strikes a deer is considered a not at fault crash meaning an insurer cannot raise a policyholder's premium.