What color are instrument hold lines?

Instrument hold lines are designed to provide clear visual guidance for pilots and ground personnel at an airfield. The solid yellow lines with parallel dashes serve an important function in airfield operations. These lines indicate where aircraft must stop when instructed, allowing for safe separation between aircraft and other vehicles or obstacles on the taxiway or runway. The solid yellow color is standard in aviation for markings that require attention, while the dashes specifically convey the hold line's purpose, ensuring visibility and emphasizing the need for caution.

Other options, while they may suggest different types of markings, do not conform to the standard for instrument hold lines. Marks that include colors or designs not typically associated with hold lines can lead to confusion and misinterpretation of the required actions near runways and taxiways. Understanding the significance of these markings is crucial for maintaining safety and operational efficiency on the airfield.