1. Freight Policy and Project Manager, Washington State Dept. of Transportation, PO Box 47407, Olympia, WA 98504-7407; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Washington.
2. Research Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, Box 352700, Seattle, WA 98195-2700 (corresponding author).
3. Professor, Dept. of Electrical Engineering, Univ. of Washington, Box 352500, Seattle, WA 98195-2700.
4. Ph.D. Fellow, Royal Danish Academy of Architecture, Institue of Planning, Copenhagen, Denmark.