What does a red line on a map typically signify?

A red line on a map typically signifies roads or populated areas. This use of red lines is common in topographic and road maps to indicate major transportation routes, including highways and main roads. In addition to representing roads, the color red can also delineate areas that are densely populated, allowing users to quickly identify urban regions and significant infrastructure on a map. Understanding the significance of colors and symbols on a map is crucial for effective navigation and situational awareness in land navigation.