What colors are used for Interstate Route Markers?

Answer: C — Blue and red

Interstate Route Markers utilize a distinctive color scheme to ensure visibility and promote consistency across the United States. The correct colors for these markers are red, white, and blue, with the shield shape predominantly featuring a blue background and red top. This color combination is designed not only for aesthetic appeal but also for high visibility, helping drivers easily identify interstate routes. The blue also symbolizes the federal highway system, while the red indicates important routes. In the context of the incorrect answers, green and white are primarily used for guide signs that provide directions, services, and mile markers, but they are not related to interstate markings specifically. Red and yellow are often associated with warning signs that alert drivers to hazards, and black and yellow typically denote cautionary signage. Each color choice serves definitive purposes within the traffic signage system, but only the red, white, and blue combination is applicable to Interstate Route Markers.