Transportation systems analysis, evaluation, and asset management; statistical and econometric methods for transportation demand modeling, pavement performance modeling, and safety and security analyses; simulation modeling for intelligent transportation systems applications; risk and uncertainty modeling, and optimization of dynamic traffic networks, infrastructure systems, and logistics problems. Multimodal transportation infrastructure and dynamic traffic network mobility, safety, security and emergency evacuation, and energy consumption/vehicle emission performance modeling Sustainable transportation asset management addressing issues of system component interdependency, integration, and risk and uncertainty