1. Civil Engineering Manager, Pima County Dept. of Transportation, 201 N. Stone Ave., Tucson, AZ 85701 (corresponding author).
2. Assistant Professor, Civil and Environmental Engineering, Univ. of Maryland, 1157 Glenn L. Martin Hall, College Park, MD 20742.
3. Assistant Professor, Dept. of Construction Management, Florida International Univ., 10555 West Flagler St., Miami FL 33174.