SAFETY EFFECTIVENESS OF STOP CONTROL AT ULTRA-LOW VOLUME UNPAVED INTERSECTIONS Corresponding Author: Reginald R. Souleyrette Department of Civil, Construction and Environmental Engineering and Center for Transportation Research & Education reg@iastate.edu Ryan J. Tenges Graduate Student/Research Assistant Center for Transportation Research & Education ryant@iastate.edu Thomas McDonald Center for Transportation Research & Education tmcdonal@iastate.edu T.H. Maze Department of Civil, Construction and Environmental Engineering and Center for Transportation Research & Education tmaze@iastate.edu Alicia Carriquiry Department of Statistics alicia@iastate.edu Iowa State University 2901 S. Loop Drive, Suite 3100 Ames IA 50010 (515) 294-8103 (515) 294-0467 (fax) Submitted: July 29, 2005 Word Count: 3744 words + 11 tables and figures = 6,494