Final answer:
The correct action to take when passing another vehicle is to check the traffic ahead, behind, and also for oncoming traffic to ensure safe passing. Signaling intentions and using mirrors are also important steps in the process, although not the direct answer to the question.
Step-by-step explanation:
When passing another vehicle, it is essential to check the traffic ahead of you, and behind you, and check for oncoming traffic before you attempt to pass. This means ensuring that the opposite lane is clear of approaching vehicles to avoid a head-on collision. Additionally, signal your intentions clearly to inform other drivers of your maneuvers, and use your mirrors to monitor the positions of cars around you. It is not advisable to speed up aggressively to pass; instead, maintain a safe and legal speed ensuring the pass can be completed without danger. While the correct answer to the question at hand would be to 'check for oncoming traffic', understanding that signaling and using mirrors are part of the overall safe process of passing another vehicle is crucial for driving safely.