What does the color yellow signify in airside markings?

The color yellow in airside markings primarily signifies caution, particularly in relation to taxiways and runways. Yellow markings are utilized to alert pilots and ground vehicle operators to be cautious and attentive as they navigate areas where the potential for conflict or issues may arise. For instance, yellow lines, symbols, and surfaces are often placed along taxiways, on runway hold lines, and in other critical areas to guide and inform operators about safe movement and operational protocols. This serves to enhance safety and prevent accidents on the airside of the airport, making it clear that one should proceed with vigilance in these designated zones.