Abstract: A tracking device for detecting the presence of an object in an immediate vicinity of a vehicle is provided. The tracking device comprises a housing, a touch screen display mounted on the housing, and at least one audio speaker on the housing. First and second infrared sensors are mounted to opposite pillars of the vehicle. A microprocessor analyzes data collected from the infrared sensors. A mounting bracket connects the housing to the vehicle. The first and second infrared sensors transmit overlapping infrared waves across an approximately one hundred eighty degree range of the vehicle's forward motion. Upon the infrared waves encountering an object, the reflected infrared wave is analyzed by the microprocessor for object type and location and upon determining that the object poses a threat to the vehicle, the tracking device advises of the imminent threat with both audible and visual emergency warnings.

Abstract: Concrete containing polyurethane is provided and construction elements comprising such concrete. Methods for the preparation of polyurethane powder for inclusion in such concrete and for the formation of construction elements comprising such concrete are also provided.