What does a blue sign with an arrow pointing both ways indicate?

Answer: B — Front horizontal road is allowed for both sides.

A blue sign with an arrow pointing both ways signifies that the road is open to traffic from both directions. This indicates to drivers that they can proceed in either direction on the road, which is crucial for understanding the flow of traffic in busy or multi-lane areas. Recognizing this sign helps ensure that drivers make informed decisions about their navigation, especially in areas where the road may be shared between vehicles proceeding in opposite directions. This understanding also reinforces safe driving practices, as drivers will anticipate oncoming traffic when they see this sign, reducing the likelihood of accidents or confusion on the road. It's essential for drivers to be familiar with these kinds of signs to maintain a smooth and coordinated flow of traffic.