Abstract: A method of controlling the sideways motion of a trailer forming part of a combination vehicle, such as a road train, for road transport of heavy goods. The vehicle has a trailer including a semi-trailer body and a dolly mounted beneath the front of the semi-trailer body. The method includes steering at least some of the wheels on said axle sets relative to the dolly frame such that at high speeds, as the vehicle turns towards one side, steering the dolly wheels to induce the dolly to move towards that side and, at low speeds, as said vehicle turns towards that side, steering the dolly wheels to induce the dolly to move towards the opposite side.

Abstract: A method of controlling a combination vehicle for road transport of heavy goods, said vehicle comprising a motor vehicle at the front and a trailer attached so as to be towed behind the motor vehicle, said trailer comprising: (a) a semi-trailer body adapted to carry goods, (b) a dolly mounted beneath the front of the semi-trailer body and connected to the semi-trailer body by a pivoting connection, said dolly comprising road wheels attached in one or more axle sets to a dolly frame, each axle set extending across the dolly frame, and (c) a drawbar assembly connecting the dolly frame to a preceding vehicle unit by means of a trailer coupling assembly, wherein: (i) the drawbar assembly defines an instant centre of rotation for the dolly which is located forwards of said trailer coupling assembly while the vehicle is moving forwards at high road speeds, and (ii) the drawbar assembly defines an instant centre of rotation for the dolly which is located at least substantially at the trailer coupling assembly while

Abstract: Measuring the unevenness of a pavement surface. A frame carrying an array of sensors is transported above the pavement surface. At a first position, the distance of each sensor is measured from respective first points on the pavement surface. The measurements are repeated for subsequent positions. Calculations from the measurements determine any change in tilt. The measurements and calculations are used to derive a measure of the unevenness of the pavement surface.

Abstract: A method of controlling the sideways motion of a trailer forming part of a combination vehicle, such as a road train, for road transport of heavy goods. The vehicle has a trailer including a semi-trailer body and a dolly mounted beneath the front of the semi-trailer body. The method includes steering at least some of the wheels on said axle sets relative to the dolly frame such that at high speeds, as the vehicle turns towards one side, steering the dolly wheels to induce the dolly to move towards that side and, at low speeds, as said vehicle turns towards that side, steering the dolly wheels to induce the dolly to move towards the opposite side.

Abstract: Measuring the unevenness of a pavement surface. A frame carrying an array of sensors is transported above the pavement surface. At a first position, the distance of each sensor is measured from respective first points on the pavement surface. The measurements are repeated for subsequent positions. Calculations from the measurements determine any change in tilt. The measurements and calculations are used to derive a measure of the unevenness of the pavement surface.