What safety measures are required for workers near traffic?

The correct choice emphasizes the importance of using high-visibility clothing and personal protective equipment (PPE) when workers are in proximity to traffic. This requirement is vital for ensuring the safety of workers as it enhances their visibility to drivers, significantly reducing the risk of accidents. High-visibility clothing, such as bright vests or jackets, typically includes reflective materials that make workers easily seen, especially in low-light conditions or poor weather.

PPE encompasses a range of equipment beyond clothing, including items like helmets, gloves, and eye protection, which help to safeguard workers against various hazards present on construction sites. By implementing these safety measures, the likelihood of injuries caused by vehicle collisions or other traffic-related incidents can be greatly minimized, ensuring a safer working environment.

While the other options mention various safety items or practices, they do not adequately address the comprehensive approach needed to protect workers from traffic hazards. Heavy machinery, reflective sunglasses, and hard hats alone do not create the same level of visibility or overall protection as the combined use of high-visibility clothing and PPE.