When changing lanes, check your mirrors:

When changing lanes, check your mirrors:

• A. Before you change lanes.
• B. after you complete the lane change.
• C. All of the above.
• D. After you signal and as you begin the lane change.

Answer: (D)

When you change lanes, you need to monitor your mirrors continuously as the maneuver unfolds. The most important moment to verify safety is right after you signal and as you begin to move into the next lane. Signaling communicates your intent, but traffic can change in those first moments as you start the shift, so you must recheck to ensure the lane is clear and no one is in your blind spots. If you wait until after you’ve completed the lane change, you’ve already committed to the move and may miss a fast-approaching vehicle or someone riding your blind spot. While checking beforehand is also a good habit, the critical safety check during the actual move is after signaling and as you begin the lane change.

When you change lanes, you need to monitor your mirrors continuously as the maneuver unfolds. The most important moment to verify safety is right after you signal and as you begin to move into the next lane. Signaling communicates your intent, but traffic can change in those first moments as you start the shift, so you must recheck to ensure the lane is clear and no one is in your blind spots. If you wait until after you’ve completed the lane change, you’ve already committed to the move and may miss a fast-approaching vehicle or someone riding your blind spot. While checking beforehand is also a good habit, the critical safety check during the actual move is after signaling and as you begin the lane change.