After overtaking, what should a driver check before rejoining the line?

Before rejoining the line after overtaking, the most critical aspect for a driver to check is the rearview mirror. This mirror provides a clear view of the traffic behind, allowing the driver to assess the distance and speed of the vehicle they just passed. Checking the rearview mirror helps ensure that it is safe to merge back into the lane without cutting off another vehicle or creating a hazardous situation.

While side mirrors are also important for checking blind spots and monitoring adjacent lanes, the rearview mirror directly addresses the driver’s need to understand the space available directly behind them after completing the maneuver. The front mirror is not typically a feature in standard vehicles, and the dashboard does not provide relevant information for this specific action. Thus, prioritizing the rearview mirror ensures both safety and compliance with road regulations when rejoining the lane.