When negotiating a sharp turn that blocks more than one lane, what must a driver do?

When negotiating a sharp turn that blocks more than one lane, it is essential for the driver to watch for vehicles coming toward them. This is critical for maintaining safety on the road, as sharp turns can obscure visibility and make it difficult for a driver to see oncoming traffic. By being vigilant and aware of other vehicles, the driver can better assess the situation, ensuring that they do not inadvertently cause an accident or create a hazardous condition for themselves and others.

The context in which this is relevant spans several safety considerations, including the potential for approaching vehicles to be unaware of the turn or of the driver's position. By prioritizing awareness and safety during the maneuver, drivers can navigate the turn more effectively and responsibly.

The other options do not prioritize the need for safety and awareness of surrounding traffic. For instance, backing up quickly could create additional hazards and confusion on the road. Speeding through the turn increases the risk of losing control of the vehicle and poses a danger to both the driver and other road users. Signaling only after the turn could lead to a lack of communication with other drivers, further increasing the risk of accidents. Overall, maintaining awareness of oncoming vehicles is the most prudent course of action when making a sharp turn in challenging conditions.