Which of the following is NOT a suggestion when passing a vehicle?

The correct choice indicates that both options A and C are suggestions that should be followed while passing a vehicle. This highlights the importance of safety measures during this critical driving maneuver.

Lightly tapping the horn before passing serves as a warning to the other driver, helping to ensure that they are aware of your presence and reducing the likelihood of an unexpected movement from them into your lane. This cautionary step reinforces the principle of communication among drivers for enhanced safety.

Assuming the other driver does not see you emphasizes defensive driving. By operating under the assumption that the other vehicle might not be aware of your intentions, you increase your vigilance and preparedness, allowing you to react appropriately if the situation changes unexpectedly.

The inclusion of "speed up significantly while passing" as a suggestion not to follow is crucial because it can lead to dangerous situations. While it is necessary to increase speed to complete the maneuver quickly, doing so significantly can lead to loss of control or a failure to maintain a safe distance when returning to the lane. Thus, option D does not align with safe driving practices during a passing scenario.

Overall, understanding these safer practices will contribute to a more secure driving environment for everyone on the road.