My research is centered on equilibrium in transportation systems. I am particularly interested in how individually optimal decisions by multiple actors, based on different objectives and behavioral principles, lead to system-level outcomes. While equilibrium-based modeling provides a common foundation for much of my work, I have broad interests in transportation and also pursue new problems that I find theoretically interesting or practically relevant. More recently, I have become increasingly interested in how theory can inform policy design, and how practical policy problems can in turn lead to new theoretical questions.
My current research interests include the following areas.
Uncertainty and heterogeneity are central themes of my work on network equilibrium. Travelers choose routes without full knowledge of network conditions: travel times fluctuate, perceptions differ from reality, and preferences vary across individuals in ways that analysts cannot fully observe. I study how these forms of uncertainty, and travelers' responses to them, shape equilibrium flows and network performance, including stochastic route choice, travel time reliability, and heterogeneity in preferences. I am also interested in how equilibrium outcomes change when travelers with different information or decision rules, such as human drivers and automated vehicles, share the same network.
I am interested in how public transportation can be sustained in regional areas facing population decline, where declining demand threatens the viability of services that residents depend on. Service reductions can lower ridership further, creating a feedback loop between service levels and demand. I aim to understand this interaction and to examine how subsidy schemes and the roles of operators and local governments can be designed to maintain accessibility at a sustainable cost.
I study the resilience of road networks under heavy snowfall: how snow degrades traffic flow and road capacity, and how local disruptions, such as stranded vehicles and road closures, propagate through the network as drivers adjust their routes. Viewing these responses through an equilibrium lens, I aim to support winter road management for more resilient networks, including identifying vulnerable road sections, planning precautionary road closures, and prioritizing snow removal operations.