Abstract: Speed bumps for mounting across roadway lanes to encourage vehicle drivers to slow down are formed of laminated layers of elongated flexible rubber strips secured together to form a speed bump unit. For low cost materials affording long life in service resilient long wearing steel belted tire tread strips are cut from the treads of discarded vehicle tires. Typical bump heights of three inches are obtained from six laminated half-inch thick layers. Layers lying flatly upon a road surface may be pyramided by a plurality of upwardly stepped layers of decreasing widths from the roadway surface to present inclined leading and trailing edges of the speed bump assemblies disposed to terminate in an uppermost crown. Fluorescent facings disposed on the speed bump unit surfaces give a driver visual night-time warning before the speed bumps are encountered by an approaching vehicle.

Abstract: An electrical machine with at least a machine unit. The machine unit includes a stator, which includes a plurality of magnetic flux conductors and an electric conductor forming a winding extending in a substantially closed winding path through each magnetic flux conductor, and a movable element, which includes permanent magnet elements movable in a reciprocating movement in relation to the stator along a movement path. The winding path includes a first current carrying portion, which extends substantially in parallel with the movement path. Each magnetic flux conductor is arranged to form, together with one of the permanent magnet elements, a closed magnetic flux circuit extending around the current carrying portion. The magnetic flux conductors are arranged in an alternating order with respect to the direction of the magnetic flux in relation to the permanent magnet elements in the respective magnetic flux circuit.

Abstract: A bridge is made from a plurality of precast arcuate spans of reinforced concrete disposed side by side between concrete facia. The facia project upwardly to an elevation above the crown of the spans. Elongated rods join the spans to each other and to the facia.