Colas 

Colas SA constructs and maintains transport infrastructure worldwide. It operates through three segments: Roads, Construction materials, and Railways. The company builds and maintains roads and highways; and works on airfield runways and aprons, seaports, industrial sites, logistics and commercial premises, city streets and urban development, reserved-lane public transport, recreational amenities and environmental protection, etc. It also engages in the renovation, demolition, and deconstruction of existing buildings; and constructs small-scale civil engineering and drainage projects. In addition, the company produces and recycles construction materials, such as aggregates, emulsions and binders, asphalt mixes, ready-mix concrete, and bitumen. Further, it designs and engineers rail projects; constructs, renews, and maintains rail networks, such as high-speed and conventional train lines, subways, metros, and tramways; lays and maintains tracks, electrification, signaling/telecommunications, safety systems, ventilation, and fire detection/protection, as well as specialty projects comprising bridge cranes, special branch lines, repair of railway tunnels; and operates a rail freight business. Additionally, the company lays and maintains pipes and pipelines for the transport of water and energy, including the construction of turnkey gas compression stations, small-scale civil engineering works, and industrial services. It also engages in the manufacture, installation and maintenance of road safety and signaling equipment; traffic management activities; and distribution of bitumen. The company was founded in 1929 and is headquartered in Paris, France. Colas SA is a subsidiary of Bouygues SA.