1. ITS Engineer, Kentucky Transportation Center, Univ. of Kentucky, Lexington, KY 40506; formerly, Centre for Smart Transportation, Dept. of Civil and environmental engineering, NREF 3-133, Univ. of Alberta, Edmonton, AB, Canada, T6G 2W2 (corresponding author).
2. Kentucky Transportation Center, Univ. of Kentucky, Lexington, KY 40506.