The Alabama Driver's Manual emphasizes regularly checking mirrors and blind spots as a crucial component of defensive driving. This practice helps the driver stay aware of the vehicles and environment around them, which is key to preventing accidents. By being vigilant about the information in mirrors and blind spots, a driver can make more informed decisions and anticipate potential hazards, thereby enhancing overall road safety. This routine is an integral part of the defensive driving strategy as it contributes significantly to maintaining awareness and readiness on the road.