How can you tell you are driving on the wrong side of the road?

When driving, a critical aspect of maintaining safety on the roads is being aware of lane markings and road signs. In the context of this question, recognizing that the yellow line is to your right is a clear indication that you are driving on the wrong side of the road.

In the United States, the yellow line typically marks the left edge of the roadway for vehicles traveling in the opposite direction. Therefore, if you observe a yellow line to your right, it means you are positioned on the incorrect side of the road, posing a potential hazard to yourself and others.

Traffic signs would generally be positioned according to the correct side of the road, so their location is not a definitive indicator of being on the wrong side. While oncoming traffic can also be a signal that you may be in the wrong lane, the most immediate and clear indicator is indeed the placement of the yellow line. Signs that are backward don't apply specifically to the situation of which side of the road you're on in a meaningful way. Hence, the clearest, safest indicator remains the position of the yellow line.