1. Center for Transportation Research, Argonne National Laboratory, Bldg 362 E-313, 6700 S Cass Ave., Argonne, IL 60439.
2. Clemson Univ., 216 Lowry Hall, Clemson, SC 29634 (corresponding author).
3. Clemson Univ., 308 Flour Daniel Building, Clemson, SC 29634.
4. M.S. student, Electrical Engineering, 318 Flour Daniel Building, Clemson, SC 29634.
5. Southern Illinois Univ. Edwardsville, 2063 Engineering Building, Edwardsville, IL 62025.