Abstract: A light and vision blocking device structured of a hollow, tubular member having an attached flange for securing the device to a highway median barrier is disclosed. The device is a semi-flexible plastic device suited for impact absorption.

Abstract: A corrugated box culvert constructed from reinforced corrugated steel or aluminum sheets having very deep corrugations and generally having a uniform bending moment profile for the whole length of the culvert.

Abstract: An improvement to an energy absorbing guard rail terminal for use on longitudinally extending roadways. The energy absorbing guard rail terminal having a number of overlapping horizontally extending parallel guard rails positioned on oppositely disposed sides of a plurality of longitudinally spaced break away posts with the upstream ends of the guard rails secured to the post. Splice bolts connect the overlapping ends of adjacent rails which are characterized by a plurality of openings within each horizontal rail aligned with the splice bolts whereby the impact of the vehicle on the upstream end of the rails will force the bolts to shred out the rail material between the openings within the rails. By absorbing the kinetic energy of the impacting vehicle, the collapseable guard rail terminal allows for safe deceleration of the vehicle upon impact, avoiding serious injury to the driver.

Abstract: A hollow, vertically standing blade having a width substantially greater than its thickness is provided with raised chevron-like configurations on its wider surfaces to deflect light directed thereagainst. A plurality of such blades mounted in spaced relation in a row on a support in the mediun strip of a highway block light from the headlights of vehicles traveling in one direction with respect to vehicles traveling in the opposite direction.