Abstract: The invention relates to the preparation of a bituminous binder on the basis of bitumen and polyolefin. This binder is prepared in a hot mixing and homogenizing process, the homogenizing being continued until the viscosity of the binder in the course of this homogenizing being distinctly or significantly reduced. The invention also relates to the preparation of a road construction material using this binder, the inorganic additive material being heated before mixing with the binder to a temperature below the decomposition temperature of the binder.

Abstract: A method of installing an electromagnetic sensor loop in a multiple lane highway for monitoring vehicle traffic which includes the steps of placing a test loop at a desired location in a highway traffic lane approximately centrally thereof and varying the lateral dimension of the test loop until the field strength generated thereby at the lane edge is such that the loop will reliably distinguish between a vehicle in the lane in question and a vehicle in the next adjacent lane.

Abstract: A screed bar support stake and method are uniquely adapted to concrete screeding operations utilizing a vibratory-type screed. The stake is formed with means which allow it to be located after the concrete has been poured and is also adapted with means enabling the stake to be removed for reuse before the concrete hardens thus saving the cost of the stake. A mating drive member facilitates easy placement of the stake.

Abstract: Means for controlling the moisture content and ultimate freeze-thaw cycle parameters of a paved roadbed including, a combination of electrolytic means together with the conventional roadbed, the electrolytic means being utilized to control the moisture migration through the soil in and around the roadbed. The system comprises a combination of a roadbed having a centrally disposed paved zone flanked by lateral shoulder zones, and electrolytic means along the shoulder zone slopes for controlling the moisture migration through the surrounding soil. The electrolytic means includes a plurality of spaced electrodes, including a plurality of anodes and a plurality of cathodes arranged in spaced-apart but electrolytically coupled relationship along the lateral shoulder zone slopes. The anode means includes crushed rock high in certain metallic oxides, with the oxides selected from the group consisting of calcium oxide and magnesium oxide such as, for example, crushed dolomitic limestone or basalt.

Abstract: The invention is a disposable, easily-removable masking cap for pavement-mounted highway reflectors to permit the taring or other re-surfacing of the roadway while protecting the reflectors so that they need not be graded off prior to resurfacing.

Abstract: A roadway barrier structure is prepared by laying a porous fabric upon a base course, bonding a barrier structure upon a portion of the porous fabric that rests upon the base course, and placing at least a portion of a traffic-bearing course upon a portion of the porous fabric that rests upon the base course and extends beyond the barrier structure.

Abstract: A device that is placed under the driveway surface and used in conjunction with a motor vehicle exhaust system to maintain an ice free driveway.

Abstract: The invention relates to forming spaced apart pits along the outer edges of the subway site which can be immediately covered with steel plates to permit normal traffic flow. The plates are removed and soldier beams placed at spaced positions in each pit. As excavation proceeds timber lagging is inserted between the soldier beams. When the excavation is made between the soldier beams, timber bracing and caps are installed across the tops of the soldier beams to receive the precast decking. Further soldier beams are then driven between the aforementioned soldier beams after the decking and bracing are removed. Excavation then can be made to permit construction of concrete walls along said further soldier beams longitudinally to comprise the outermost edges thereof. Sewer and gas mains are then laid along the concrete walls of either or both of them, optionally, but preferably exterior thereof to permit ready connection to dwellings or buildings.

Abstract: The invention relates to construction of subways or the like using precast, prestressed, ribbed arch concrete panels to build subways with or without utility chambers and above or below ground water. One approach constructs a subway without utility chamber substantially entirely through the use of the concrete panels while the other constructs a subway with utility chamber utilizing poured concrete walls for the utility chamber with the procedure being adapted to a cut and cover method for minimal influence on traffic flow and the train tunnel being formed of the concrete panels.

Abstract: A heating system includes fluid ducts at the surface of a road and heating fluid for deicing the road surface when circulated through the ducts. A pump device for circulating the heating fluid through the fluid ducts to deice the road surface comprises a fluid pump housed beneath the surface of the road and coupled to the fluid ducts. The fluid pump has a piston and an actuator plate coupled to the piston. The actuator is pivotally mounted at the surface of the road in a manner whereby the weight of a vehicle passing over the actuator plate operates the pump device to circulate the heating fluid through the fluid ducts.

Abstract: A vehicle deceleration bed comprises two portions of a cured non-resilient aminoplast resin foam material, the density and/or the compressive strength of the foam in one portion being different from that of the other portion. Preferably the portions are arranged in layers and in the case of an aircraft deceleration bed, the lowermost layer is the strongest, each such successive layer being of progressively lower strength.

Abstract: A plurality of portable road-type structures which contain a variety of differently shaped surfaces to simulate driving conditions which might be experienced by an individual driving a vehicle, for example, a motorcycle. The portable road-type structures are used as an educational tool for giving the driver the fundamental knowledge and technique for driving a motorcycle before he is exposed to actual driving conditions.