Abstract: A robotic device (300) for inspecting structures, comprising: a body (302) extending in a longitudinal direction of the robotic device (300), the body (302) having a front end (304), a rear end (306), and opposing sides (312), (314) extending between the front end (304) and the rear end (306); a plurality of legs (316) arranged on each of the opposed sides (312), (314) of the body (302), each leg (316) comprising one or more joints; and a plurality of carriages (315), each carriage (315) connecting a leg (316) to the body (302) and being configured to allow each leg (316) to translate in a longitudinal direction relative to the sides of the body, and wherein each of the carriages (315) is configured to move independently of each of the other carriages such that a leg separation may be varied, the leg separation being the distance between any two adjacent legs on one side of the body.