THERMAL PAVEMENT CRACKING WEST TEXAS by Samuel H. Carpenter Robert L. Lytton Reserach Report Number 18-4F Environmental Deterioration of Pavement Research Study 2-8-73-18 conducted for the State Department of Highways and Public Transportation in cooperation with the U.S. Department of Transportation Federal Highway Administration by the TEXAS TRANSPORTATION INSTITUTE Texas A&M University College Station, Texas October, 1977