What type of lights indicate the start of a runway?

The green lights are used to indicate the start of a runway. This is an essential feature for pilots during takeoff and landing as they help to visually confirm the runway's beginning. Green lights are typically installed at the threshold of the runway, providing a clear and distinct indication that the runway is accessible for takeoff or landing operations. This color is universally recognized in aviation for its association with safety and go-ahead signals, making it an effective guide for pilots navigating towards the runway. The presence of these lights significantly enhances situational awareness, particularly in low visibility conditions.