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Roadway grip tester and method

  • US 20070204683A1
  • Filed: 01/11/2007
  • Published: 09/06/2007
  • Est. Priority Date: 01/11/2006
  • Status: Active Grant
First Claim
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1. In a method for measuring road surface friction of a road surface using a vehicle that moves across the road surface wherein (1) an auxiliary independent wheel assembly is towed behind said vehicle and is in contact with the road surface, an auxiliary wheel of said wheel assembly is freely rotatable by movement of said vehicle and being one or more of toed in or toed out with respect to a direction of travel of said vehicle so as to create an isolated axial force on said auxiliary wheel:

  • (2) the axial force on said auxiliary wheel is measured while said vehicle moves across said road surface; and

    said measured axial force is correlated with the road surface friction;

    the improvement which comprises the steps of;

    (A) the independent wheel assembly is load isolated from the weight of said towing vehicle; and

    (B) the independent wheel assembly is loaded by placing ballast thereon.

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