Presented is a heavy vehicle, such as a transport vehicle or civil engineering vehicle, of a mass greater than 500 metric tons configured to carry heavy loads and operable to generate a motive power. The vehicle includes tires of radial structure having a diameter greater than 3.5 meters and an axial width greater than 37 inches, a front steering axle coupled to at least two tires, at least one rear axle coupled to at least two tires and by which is transmitted at least part of the motive power, and a third, intermediate axle coupled to at least two tires. The intermediate axle is a steering axle and is moveable to a raised position. When the intermediate axle is in the raised position, the tires coupled to the intermediate axle are not in contact with the ground.