What safety device is essential when working near traffic?

Cones, barrels, and warning signs are essential safety devices when working near traffic because they serve a critical function in alerting drivers to the presence of work zones and potential hazards. These devices help to redirect vehicles safely away from workers, equipment, and any areas where construction or maintenance is taking place. By using these safety devices, visibility is increased, and the likelihood of accidents is significantly reduced.

The use of cones and barrels creates visual cues that can effectively guide drivers, prompting them to reduce speed and exercise caution in areas where workers are present. Warning signs convey important information and can indicate dangers, providing an additional layer of safety for both the workers and motorists. This combination is key for maintaining a safe work environment in proximity to active roadways.

While other options, such as reflective vests and flags, are also important for worker visibility and personal safety, they primarily focus on protecting the individual workers rather than managing traffic flow around the work zone. Barriers and fences can provide physical protection but may not always be practical or effective in every work situation compared to the clear, immediate communication afforded by cones, barrels, and warning signs.