Under what condition can you pass another moving vehicle on its right?

Answer: B — After signaling right for at least 3 seconds

Passing another moving vehicle on its right is governed by specific conditions to ensure the safety of all road users. The correct option highlights the importance of signaling, which is essential for informing other drivers of your intent to change lanes or pass another vehicle. Signaling right for at least three seconds provides adequate warning to those around you that you are about to maneuver, which is crucial for safe interactions on the road. Additionally, effective signaling allows other drivers to adjust their actions accordingly, reducing the risk of accidents. Proper use of turn signals is not just a legal requirement but also a fundamental part of defensive driving, ensuring that everyone is aware of what other drivers intend to do. The other options may seem plausible but do not capture the essential requirement of signaling when passing. Traveling at a lower speed does not guarantee safety, and passing can still be dangerous even if there are no oncoming vehicles without proper signaling. A designated lane for passing is important, yet it is the act of signaling that primarily ensures everyone is on the same page about your actions.