Abstract: A mobile device for forcing a highway post into the ground in the vertical position, especially where the highway post is flexible and made of fiberglass, which involves a vertical column spaced from and supported by the mobile device, guide means mounted on the vertical column to hold a reflective highway post in a vertical position while the post is forced into the ground by repetitive blows from a hydraulically driven hammer and means for moving the vertical column and the guide means upwards in a vertical direction when the post has been forced a sufficient distance into the ground.

Abstract: A self-propelled concrete cutting saw in which the saw and self-propelled platform associated with the saw are both driven by hydraulic motors, with separate motors for each of the two propelling wheels so that the device may be steered by varying the speed of either of the wheels, with the speed of longitudinal movement of the saw through the concrete being controlled by the density of the concrete being cut by the saw so that the saw blade is operated at an optimum rotational speed.

Abstract: A device for cutting slots of varying lengths and shapes in pavement to receive a reflector, the cutting blades for cutting the slot always being at right angles to the tangent to that portion of the surface of the pavement where the slot is being cut and means permitting the cutting blades to be maintained at an optimal rotational speed regardless of the density of the type of pavement encountered.