What color are all runway markings at O'Hare Airport, except for specific exceptions?

Runway markings at O'Hare Airport, with specific exceptions, are predominantly white. This color is used for runway markings to ensure high visibility against the asphalt or concrete surfaces of the runways. White markings help pilots clearly identify their position and the operational areas of the runway, as they are standard for airports across the United States and globally. The use of white for runway markings follows international standards set by the International Civil Aviation Organization (ICAO) and is essential for safety and operational clarity in aviation environments.

Other colors, like red and yellow, are typically used for different purposes, such as indicating prohibited areas or taxiway markings, but they do not apply to the standard runway markings. Black is not a color used for runway markings at O'Hare. Therefore, the use of white is key for ensuring that pilots can safely and effectively navigate the runway environment.