the roller keeps lid 2 at the level shown by the point dashed line the eccentric mounting centre of the roller is illustrated with a solid point while the centre axis of the roller is illustrated by a cross thus it is clear that the centre axis of the roller is located vertically above the mounting centre of the roller in its upper position this is shown by the vertical line l all the weight of lid 2 and vertical loads from passing vehicles will obviously be transferred to the shaft and bearings in the mounting centre and cannot be transferred to transmission systems and actuators in the right picture the roller has been rotated by the actuator 11 to its lower position the centre of rotation is marked by the filled point which means that the centre axis of roller 3 now is directly below the eccentric mounting centre of roller 3 this is shown by the cross which is now on vertical line l below the mounting centre even in this situation it is clear that all vertical loads from lid 2 are transferred only to shaft and bearings in the bearing centre when a vehicle has activated the module on passing lid 2 flips back to its initial position as the roller again rotates to its initial position the.