Civil engineer conducts research, designs, plans and oversees construction and maintenance activities on structures and facilities such as bridges, roads, airports, railways, pipelines and industrial and other large buildings. He/she establishes control systems to ensure efficient functioning of structures as well as safety and environmental protection. He/she organises and directs maintenance and repair of existing civil engineering structures. He/she may analyse the stability of structures, collect and test samples to study the behaviour of soil, rock or construction materials under proposed design parameters.