Abstract: A rigid self-supporting highway delineator post having reflective material mounted at the upper end and a first flex area at a height above grade and a second flex area located immediately below the reflective material whereby the post is non-destructively bent down about the lower flex area when hit by a moving vehicle and may be bent about the upper flex area to facilitate removal and insertion of sheets of reflective material.

Abstract: An improved underground drainage pipe formed of an extruded stiffly flexible plastic member having a trough with spaced upstanding lips and an integral overlying roof with triangular shaped drainage openings formed through the lips at regular intervals along the length of the pipe. When buried, the drainage openings resist clogging by gravel or pebbles in the surrounding soil thereby improving the drainage capability of the pipe. The thickness of the trough increases from the center point to the lips thereby compensating for the drainage openings and enabling the pipe to withstand vertical loading forces.

Abstract: A highway marker having a base inserted into a hole formed in highway pavement so that the upper surface of the base is below the surface of the pavement and an integral upstanding flexible tab which projects above the surface of the highway. A light reflecting member is secured on one side of the tab for reflecting light directed against the member to indicate the location of the marker. The height of the tab is less than the distance from the base of the tab to the side of the marker facing away from the light reflecting member so that when a vehicle is driven over the marker the tab is bent down against the top of the base below the surface of the pavement and flexes back to the upright position upon passage of the vehicle. The surface of the light reflecting member may be angled back at a 4.degree. angle with respect to the vertical to improve reflection back to drivers of vehicles approaching the marker.