Transportation and traffic planning in small cities, urban environmental issues, two-lane highways, modeling school transport, low-cost methods in traffic estimation
2004 : Consultant, National Transport Commission of Sri Lanka (part-time)
2005 : Senior Research Specialist, ARRPEEC (Asian Regional Research Programme on Energy, Environment and Climate), Asian Institute of Technology, Bangkok, Thailand
2008 – 2009 : Senior Lecturer in Civil Engineering, University of Ruhuna