When are you allowed to drive on the right side of a road with traffic in both directions?

The correct response highlights the role of a traffic officer in directing traffic. There are specific scenarios when drivers may need to change lanes or positions on the road to ensure safety and compliance with road laws. When a traffic officer gives a directive to drive on the right side of the road, it typically means that there is a reason—such as an obstruction or special circumstances—that requires you to follow their instructions.

Conversely, while safety is always a priority (as highlighted in other choices), driving on the right side of the road without proper authority or specific conditions—such as engaging in overtaking—is not typically a standard practice during regular driving. A roadblock may indicate a situation requiring assistance or deviation from normal traffic flow, but it does not grant unrestricted permission to drive against the flow. Other options like timing conditions, such as sunset, hold no relevance in this context and do not govern the allowance to deviate from established traffic rules.

This emphasizes the importance of following instructions from those trained in managing road traffic, as they can assess the situation and ensure that all vehicles proceed safely.