Which of the following is a safe practice when passing another vehicle?

The correct practice when passing another vehicle is to check that you can see their headlights in your mirror. This indicates that you have sufficient clearance to safely merge back into the lane after passing. It's crucial to ensure that there is enough space between your vehicle and the one you're overtaking before re-entering your lane. This practice helps prevent collisions and ensures both your safety and the safety of the other driver.

When considering the other options, accelerating quickly can be dangerous as it may lead to a loss of control or a situation where you cannot judge the distance and speed of oncoming traffic effectively. Honking to alert the driver is generally not recommended, as this can create confusion rather than improve safety. Passing during daylight hours is a good practice for visibility, but it is not the only safe time to pass, provided that conditions are favorable, such as adequate lighting and visibility. Each of these points highlights the importance of situational awareness and caution while passing other vehicles.