What is a critical factor in defining a work zone under RWP guidelines?

The defining characteristic of a work zone under Roadway Worker Protection (RWP) guidelines is the proximity of employees to the tracks. This is critical because the primary concern in RWP is ensuring the safety of workers who may be exposed to moving trains and other hazards associated with railroad operations. When employees are close to the tracks, there is an increased risk of accidents, making it essential to identify and manage these zones effectively.

Understanding the proximity helps establish the necessary precautions, such as the implementation of protection measures, signaling systems, and communication protocols. It determines how far away from the tracks workers must be to minimize risk and informs the creation of safety plans tailored to the specific environment and exposure level. Thus, the key to a well-defined work zone is recognizing how close workers are to operational areas, ensuring their safety through appropriate RWP measures.