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What is the most important rule when passing another vehicle?

  1. Passing must be done quickly

  2. Increase speed to ensure passing

  3. Ensure that passing can be done safely

  4. Honk the horn to alert vehicle being passed

The correct answer is: Ensure that passing can be done safely

Passing must be done quickly is incorrect because passing should not be rushed, rather it should be done carefully and safely. Increasing speed is also incorrect because this can be dangerous and may lead to an accident. Honking the horn is not necessary and may startle the other driver. The most important rule when passing another vehicle is to ensure that passing can be done safely. This means checking for potential hazards, signaling properly, and having enough time and space to safely complete the pass. Safety should always be the top priority when passing another vehicle.