Final answer:
Safe drivers should check their rearview mirror every five to seven seconds to maintain situational awareness and identify potential hazards or changes in traffic conditions.
Step-by-step explanation:
Safe drivers should check their rearview mirror every five to seven seconds. This is important for maintaining situational awareness and identifying any potential hazards or changes in traffic conditions. By regularly checking their rearview mirror, drivers can stay informed about what is happening behind them and make appropriate decisions to ensure their safety and the safety of others on the road.