A unit equalling 1000 pounds of force upon a surface (i.e. “kilopound”). In transportation, it is used to describe the load bearing wear upon a roadway. Often expressed as a component of an indicator of truck wear upon a road surface, it is expressed as “Equivalent Single Axle Load” (ESAL), which is comprised of 18 kip, or 18,000 lbs. per axle on a truck.