What do holding lines on a taxiway indicate?

Holding lines on a taxiway are critical markings that instruct pilots where to stop and wait for further instructions from air traffic control before continuing their movement on the airport surface. These lines are typically solid yellow and are used to denote the points at which aircraft must hold short of an intersection, runway, or other area where they need explicit clearance to proceed. This procedure is essential for maintaining safety and preventing runway incursions, ensuring that aircraft do not inadvertently enter active runways or interfere with other aircraft operations without proper authorization. Consequently, understanding the function of holding lines is crucial for safe ground operations at airports.