What is the purpose of taxiway edge markings?

Taxiway edge markings serve a critical role in guiding vehicles and aircraft along taxiways while maintaining safety and operational efficiency on the airside of the airport. These markings are painted on the surface of the taxiway and provide visual cues that help pilots and vehicle operators understand the limits of the taxiway and navigate appropriately.

The markings establish the boundaries of the taxiway, ensuring that aircraft and vehicles remain within designated areas during taxiing operations. This guidance is essential in preventing accidents and ensuring safe movement in potentially congested and high-traffic environments inherent to airport operations.

In contrast, the other options refer to functions that are not aligned with the specific role of taxiway edge markings. For example, markings indicating aircraft landing directions focus on runway operations rather than taxiing; boundaries of the runway are defined by different markings; and restricted areas are indicated by other types of signage and markings that explicitly denote areas where access is limited or prohibited. Thus, the correct choice accurately reflects the purpose of taxiway edge markings.