The duty of a Lookout is to:

The role of a Lookout is crucial in maintaining safety in work zones, particularly when it comes to managing the risks posed by approaching traffic. Watching approaching traffic enables the Lookout to provide timely warnings to fellow workers about any vehicles that may pose a threat to their safety. This proactive approach helps to prevent accidents and ensures that all workers are aware of their surroundings, allowing them to take necessary precautions.

Monitoring traffic conditions enhances situational awareness among all crew members and allows for effective communication about when it might be safe to proceed with work or when action is needed to relocate to a safe area. In this context, the primary focus of the Lookout is on the traffic dynamics surrounding the work zone, making option B the correct choice.