Highway marker with reflectors

Claim 1

A MARKER ADAPTED TO BE EMBEDDED IN THE PAVEMENT OF A HIGHWAY COMPRISING A RESILIENT ELEMENT HAVING AN UPPER PERIPHERAL EDGE ADAPTED TO LIE FLUSH WITH THE PAVEMENT, THE ELEMENT HAVING AN UPPER SLOPING SURFACE EXTENDING ABOVE THE UPPER EDGE, REFLECTOR MEANS EMBEDDED IN THE TOP OF SAID ELEMENT SUBSTANTIALLY FLUSH WITH SAID SURFACE, SAID ELEMENT BEING HOLLOW AND PROVIDED WITH A PASSAGEWAY CONNECTING THE INTERIOR OF THE MARKER WITH THE UPPER SURFACE THEREOF WHEREBY AIR MAY FLOW TO AND FROM SAID INTERIOR DURING COMPRESSION AND EXPANSION OF SAID ELEMENT, SAID PASSAGEWAY BEING PROVIDED WITH AUTOMATIC VALVE MEANS OPEN BY AIR PRESSURE AND PREVENTING ENTRY OF DIRT INTO SAID INTERIOR, SAID ELEMENT HAVING A LOWER PORTION BEING CONTAINED WITH A RIGID HOUSING ALSO HAVING AN UPPER PERIPHERAL EDGE COPLANAR WITH SAID FIRST-MENTIONED EDGE, AND SAID PASSAGEWAY CONSTITUTING A GROOVE IN THE OUTER SIDE SURFACE OF SAID LOWER PORTION CLOSED BY A WALL OF SAID HOUSING, SAID VALVE MEANS COMPRISING A RESILIENT FLAP SECURED TO SAID ELEMENT AND EXTENDING OVER THE UPPER END OF SAID GROOVE SUBSTANTIALLY FLUSH WITH SAID EDGES.