What must employees do before working near active taxiways or runways?

Before working near active taxiways or runways, it is essential for employees to obtain prior clearance from Airfield Operations. This requirement is in place to ensure the safety of both personnel and aircraft operating in those areas. Airfield Operations is responsible for coordinating activities on the airfield, managing the safe interaction between ground vehicles and aircraft, and ensuring compliance with regulations.

Securing clearance involves checking for active flight operations, understanding specific rules and procedures, and receiving guidance on how to proceed safely in the vicinity of aircraft movements. This step is crucial as it minimizes the risk of accidents and enhances overall operational safety in a highly dynamic airport environment.

While the other choices relate to safety measures, such as training or wearing high-visibility clothing, they do not fulfill the specific requirement of obtaining clearance, which is a critical first step before any work can begin in these sensitive areas.