What is the color of the line that indicates a lead in line?

The color of the line that indicates a lead-in line is yellow. In aviation, yellow is commonly used for marking purposes both on the airside and in various operational contexts. The use of yellow lines serves to provide clear visual guidance for pilots, ground vehicles, and other personnel to maintain safety and awareness in and around the airfield.

Lead-in lines are critical in helping to direct vehicles towards taxiways, runways, and other operational areas, capturing attention effectively due to the specific hue associated with caution and guidance. This color helps differentiate them from other lines used on airfields, ensuring that personnel can quickly identify the correct path to follow.