What should you do after overtaking a vehicle?

After overtaking a vehicle, it is essential to look in your rearview mirror to ensure that it is safe to return to your lane. This action allows you to check that you have enough space to maneuver back safely without cutting off the overtaken vehicle. It also helps you confirm that there are no other vehicles approaching rapidly from behind, which could pose a danger if you switch lanes prematurely.

Turning off your headlights is not relevant to overtaking and could create a hazard for other drivers, especially at night. Checking your fuel level is important for long journeys, but it does not directly relate to the immediate safety concerns of overtaking. Similarly, increasing your speed immediately after overtaking is unnecessary and potentially dangerous, as it may lead to losing control or not settling back into the traffic flow appropriately. Thus, the most responsible action after overtaking is to check your rearview mirror.