What is the main function of the runway lights at O'Hare Airport?

The main function of the runway lights at O'Hare Airport is to outline the runway during night operations. This is crucial for pilots as it provides visual references that help them identify the runway's boundaries and align for takeoff and landing, especially under low visibility conditions. The lights are designed to enhance safety by preventing runway incursions and ensuring that pilots have a clear and unobstructed view of the runway layout. By effectively outlining the runway, these lights play a vital role in maintaining efficient airport operations during nighttime or adverse weather conditions.