A sign indicating traffic may flow on both sides is represented by what?

Answer: B — yellow diamond with two black arrows

The sign indicating that traffic may flow on both sides is represented by a yellow diamond with two black arrows. This shape and color combination is standard in traffic signage to alert drivers to specific conditions or hazards. The yellow diamond shape is used to indicate caution, while the presence of two black arrows in opposite directions visually communicates that vehicles can travel in both directions. This is critical information for drivers to be aware of, as it impacts how they should navigate an area where oncoming traffic may occur. Understanding this sign helps ensure safe driving practices, especially in areas where lanes may not be clearly defined.