Five Color Marks in Civil Engineering

Quick answer：

The five color marks in civil engineering typically refer to the use of colors to indicate different aspects of construction work such as safety hazards, required actions, or material types. These colors are part of standardized safety practices and include red for danger, yellow for caution, blue for mandatory actions, white for cautionary or informational purposes, and green for safety or completion. These color codes help ensure a safe working environment and proper communication on construction sites.