When driving in normal conditions, drivers should check their rearview mirror for traffic behind them:

Every 4-6 seconds.
Every 4-5 seconds.
Every 6-8 seconds.
Every 3-4 seconds.
Explanation

Besides watching traffic ahead of them, drivers must also check traffic behind them. Ideally you should glance in your rear-view or side mirrors every 6 to 8 seconds, but if traffic is heavy you should check more often than that.

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