Rain drainage grooves in a road and apparatus for making them

  • US 4,701,069 A
  • Filed: 12/10/1986
  • Issued: 10/20/1987
  • Est. Priority Date: 12/10/1986
  • Status: Expired due to Term
First Claim
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1. A road marker system including a road having a shoulder below an edge of the road, a plurality of grooves intersecting said edge of said road and having portions which extend into the road surface, each said groove being straight, each groove having a forward side wall and a rearward side wall, the longitudinal axis of each groove being at an angle to the longitudinal direction of the road, the grooves having slanted or arcuate sides, at least a portion of said slanted or arcuate groove sides being coated with a retro reflective coating, the bottoms of the grooves being slanted downwardly towards said road edge,each groove being of a maximum depth at the edge of the road and becoming lesser in depth with increasing distance from the edge of the road,the groove bottoms adjacent said road shoulder being even with or above said shoulder, each groove being of a shape complementary to a portion of the curved surface of a cylinder, whereby rain water will run off the sides of the grooves and into the bottoms of the grooves and out of said bottoms to said road edge and onto said shoulder, to thereby maintain the retro reflective coating free of water so that said coating will be visible to thereby make said road edge visible to motorists during hours of both darkness and rain, and whereby when glare on the road is present from illumination other than from headlights of the driver, a series of shadow depressions will be seen by the driver.

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