Colas SA constructs and maintains transport infrastructure primarily in France. It operates through Roads Mainland France, Roads Europe, Roads North America, Roads Rest of the World, and Specialized Activities segments. The company builds and maintains roads and highways, as well as works on airfield runways and aprons, seaports, industrial sites, logistics and commercial premises, street construction and urban development, reserved-lane public transport, recreational amenities and environmental protection, etc. It also constructs small-scale civil engineering and drainage projects.