What color are the runway markings at O'Hare Airport?

Runway markings at O'Hare Airport are indeed white outlined in black. This color scheme is standard for runways across many airports, as it helps provide clear visibility for pilots, both during the day and at night. The white markings indicate the centerline, threshold, and other key elements necessary for safe landings and takeoffs. The addition of the black outline enhances the contrast against the runway surface, especially helpful in poor weather conditions or low light, ensuring that pilots can easily identify important features of the runway. Thus, this color combination is critical for maintaining safety and operational efficiency within the airspace.