During rain, when is returning to your lane considered safe?

Returning to your lane during rain is considered safe when you can see the other vehicle's headlights. This is crucial for ensuring that there is enough space and visibility to change lanes without endangering yourself or other drivers. The headlights indicate that the vehicle is close enough to be recognized and helps you gauge the distance between your vehicle and theirs. It is important to have a clear visual reference of the other vehicle's position, especially in wet conditions, where visibility can be reduced.

The other choices do not prioritize safe visibility. Returning immediately after passing does not allow for adequate assessment of the situation. Assuming there is no traffic can be misleading, as there may be vehicles that you are unaware of, especially in poor weather conditions. Honking your horn is not a standard or reliable method for ensuring it’s safe to switch lanes and may unnecessarily startle other drivers.