Which action is considered a safe practice when passing another vehicle on a highway?

The action of ensuring no oncoming traffic is present when passing another vehicle on a highway is indeed a critical safe practice. This step helps to avoid potential collisions with vehicles that may be traveling in the opposite direction. When passing, it's important to assess the road ahead for oncoming traffic, as well as to consider the speed of both your vehicle and the vehicles around you.

Passing should only be initiated when the road is clear and you have a sufficient view, as this allows for a safe and successful maneuver. By confirming that no oncoming vehicles are present, you can proceed with confidence and maintain safety not just for yourself but also for other road users. This proactive approach is essential for reducing the risk of accidents during passing situations.

The other options referenced practices that do not contribute to safe passing. Rapid acceleration can lead to loss of control and increase the risk of accident. Using turn signals after completing the maneuver does not communicate your intentions to others ahead of time, and neglecting to check blind spots could lead to collisions with vehicles that are already in the lane you plan to occupy.