What color on a military map typically indicates main roads and built-up areas?

The color red on a military map is used to indicate main roads and built-up areas because it stands out prominently, making these critical features easily identifiable for navigation and operational planning. Red is often associated with high-traffic zones or urban developments, allowing military personnel to quickly recognize important transportation routes and populated areas that may require attention during operations or logistical movements. This color-coding is part of standard military mapping conventions, which ensure consistency and clarity across maps used in various fields of operation. Such conventions facilitate quick comprehension of geographic layouts and facilitate effective decision-making in the field.