Highway warning device

Claim 1

A portable highway warning device comprising: a mat having a substantially flat lower surface and an upper surface, said mat fabricated of a flexible resilient composition having an elongated rectangular periphery characterized by a long length direction having a leading edge and a trailing edge and a short length direction defined by two end panels, said upper surface of said mat having an undulated surface defined by a plurality of wave crests and a plurality of wave troughs positioned between said wave crests, the transition from said wave crest to said wave trough to said adjacent wave crest characterized by a curved incline, said curved incline on said leading edge of said mat defining an up ramp to said mat and said curved incline on said trailing edge of said mat defining a downward incline from said mat, said undulating upper surface and said flat lower surface extend from said opposing end panels in said long length direction, terminating a distance apart on said long length direction thereby enabling said mat to be folded in half so that said lower surfaces of said halves are in abutment, whereby: when said mat is placed on said road surface with said lower surface in contact with said road surface and said length direction oriented transversely to the direction of vehicular t ravel, passage of the wheels of a vehicle across said mat and said undulating upper surface produces a discernible audible sound and a discernible vibration to the vehicle operator.