• Highway Engineering
• Transportation Engineering
• Traffic Engineering
• Surveying
• Building Construction and Materials
• Research Methodology

• Transportation/Road safety
• Transportation regulation violations and road safety countermeasures
• Traffic planning
• Vehicle crash data analysis and modeling
• Pedestrian facilities
• Urban design and complete streets

Journal Articles

• R. Pasindu, R. K. T. K. Ranawaka, R. M. K. Sandamal, and T. W. K. I. M. Dias. Jun. 2021, “Incorporating road safety into rural road network pavement management,” International Journal of Pavement Engineering, doi: 10.1080/10298436.2021.1942469 
• Shams, S. Dissanayake, and I. Dias. Jul. 2019, “Safety effects of adding bypass lanes at rural two-lane, two-way unsignalized intersections,” https://doi.org/10.1080/19439962.2018.1546784, vol. 12, no. 6, pp. 727–745, doi: 10.1080/19439962.2018.1546784.
• Dias, and S. Dissanayake. 2014. “Characteristics of Red-Light-Running Crashes and Evaluation of Retro-Reflective Signal Backplates in Preventing Red-Light-Running Violations.” Advances in Transportation Studies, no. 34 (November): 19–32.
• Dias and S. Bandara. Oct. 2012, “A score card to evaluate pedestrian safety in urban environments using walkability measures,” Injury Prevention, vol. 18, no. Suppl 1, p. A25.1-A25, doi: 10.1136/INJURYPREV-2012-040580C.4

Conference Proceedings

• K.T.K. Ranawaka, H.R. Pasindu, T.W.K.I.M. Dias, July 2021. “A Framework for Selecting Safety Treatments for Rural Roads”. in 12th International Conference on Road and Airfield Pavement Technology.
• R. Pasindu, R. K. T. K. Ranawaka, R. M. K. Sandamal, H. V Thanuwara, and T. W. K. I. M. Dias. Jan. 2021, “Incorporating Road Safety in Rural Road Network Level Pavement Management,” in Transportation Research Board 100th Annual Meeting, p. 20p. Available: https://trid.trb.org/view/1760004
• T. G. Rathnasiri and T. W. K. I. M. Dias. Dec. 2020, “Study of the Impact on Road Safety on Arterial Roads due to Close Distance Access Roads,” in Transport Research Forum, pp. 24–25. Available: https://uom.lk/sites/default/files/civil/files/TRF%202020_0.pdf
• P. Wijeweera and T. W. K. I. M. Dias. Dec. 2020, “Assessing the Walk-Score of Walking Paths in Kandy City Area for Better Walking Experience for the Tourists,” in Transport Research Forum, pp. 20–21. Available: https://uom.lk/sites/default/files/civil/files/TRF%202020_0.pdf
• W. K. I. M. Dias and K. A. S. Dilruk. 2020, “Evaluating the Influence of Countdown Timers at Signalized Intersections on Red-Light Running.” In 13th International Research Conference – Kotelawala Defence University. Ratmalana.
• W. K. I. M. Dias and W. P. D. A. Weerakkody. 2020, “Evaluating Driver Speeding at Traffic Signal Lights During the Amber Time: With and Without Countdown Timers.” In 13th International Research Conference – Kotelawala Defence University. Ratmalana
• W. K. I. M. Dias and N. H. A. R. S. Ekanayake, 2020. “Evaluating the Efficiency of a Traffic Signal Light Over a Traffic Policeman” In 13th International Research Conference – Kotelawala Defence University. Ratmalana.
• A. I. A. Suraweera and T. W. K. I. M. Dias. 2019, “Evaluating Scenarios for Railway Transportation of Coal from Trincomalee to Chilaw,” in 113th IESL Annual Sessions, pp. 505–512
• J. De Silva and T. W. K. I. M. Dias, 2019. “Necessity of Providing Training on Expressway Driving for Drivers in Sri Lanka,” in 113th Annual Sessions of the IESL, pp. 521–530.
• G. J. S. J. Amarasinghe. and T. W. K. I. M. Dias, 2020. “Traffic Study and Possible Solutions for Traffic Congestion in Rathnapura Town,” in 113th Annual Sessions of IESL, pp. 145–150
• J.A. D. Weerasinghe and T. W. K. I. M. Dias, 2019. “Evaluating the pedestrian behavior at uncontrolled mid-block pedestrian crossings,” in 12th International Research Conference, p. 50.
• M.J. De Silva and T. W. K. I. M. Dias, 2019. “Investigating improvements for training on expressway driving for drivers in Sri Lanka,” Available: http://dl.lib.uom.lk/handle/123/16278
• W. K. I. M. Dias and M. M. L. Madurapperuma, 2018. “Evaluating the requirement of new rules and regulations for three-wheelers to improve safety and reduce traffic congestion,” in SLAAS Annual Sessions, p. 42. 
• A.U. Kulasuriya, K. A. B. Weerasinghe, and T. W. K. I. M. Dias, 2018. “Road Vehicle Instabilities in High Winds in Sri Lanka,” in Annual Sessions of IESL, pp. 245–253. 
• B.M. N. Mendis, and T. W. K. I. M. Dias, 2018. “Evaluating the Existing Conditions of Borupana Road and Identifying Measures to Reduce the Traffic Congestion Therein.” In Kotelawla Defence University International Research Conference, 35–35. Ratmalana.
• H. M. I. W. B. Herath, and T. W. K. I. M. Dias, 2018. “Factors Affecting Pedestrian Visibility at Nighttime for Motor Cyclists.” In 11th International Research Conference – Kotelawala Defence University, 36. Ratmalana. 
• K. D. P. Damsara, W. M. G. D. Weerasekara, R. M. N. T. Sirisoma, and T. W. K. I. M. Dias. 2018. “Introducing a New Traffic Operational Strategy to Minimize Congestion on Galle Road; Dehiwala – Wellawatta .” In 11th International Research Conference of Kotelawala Defence University, 122–28. Ratmalana.
• T.M. N. O. Thennakoon, and T. W. K. I. M. Dias, 2018. “Feasibility Study for a Shuttle System on Kandawala Road from Kotelawala Defence University to Galle Road.” In 11th International Research Conference – Kotelawala Defence University, 38. Ratmalana.
• H.O. C. Vidyananda, M. T. Gunasekara, K. C. S. Gunarathna, and T. W. K. I. M. Dias, 2018. “Redesigning the Kandawala Road to Improve the Flow of Traffic and Increase Its Level of Service.” In 11th International Research Conference – Kotelawala Defence University, 49. 
• A. Suraweera, and T. W. K. I. M. Dias, 2018. “Smart City Concept for Sri Lanka; Producing Energy Using Footsteps.” In Proceedings of the Wayamba University International Conference, Sri Lanka, 65
• J. M. S. B. Jayasundara, and T. W. K. I. M. Dias, 2018. “An Overview of Motorcycle Crashes in Sri Lanka with a Comparison between Public Opinion and Police Crash Data.” In Transport Research Forum, 32–33. Moratuwa: University of Moratuwa, Sri Lanka.
• S. Fernando, and I. Dias, 2017. “Evaluating the Current Condition of Public Bus Transport. Case Study: Colombo – Kesbewa Bus Route.” In International Conference on Advances in Highway Engineering & Transportation Systems (ICAHETS) 2017. Negombo: University of Moratuwa.  
• I. Dias, L. Perera, S. Bandara, and K. S. Lim, 2016. “Review of Internal and External Transportation Issues of Artificial City Developments: Port City, Colombo, Sri Lanka.” In 38th Australasian Transport Research Forum (ATRF 2016), 10. Melbourne, Victoria, Australia. https://trid.trb.org/view/1457906.
• I. Dias, and S. Dissanayake, 2016. “Comparison of Factors Affecting Work Zone Crash Severity between Nighttime and Daytime.” In 95th TRB Annual Sessions. Washington, D.C.: Transport Research Board
• I. Dias, and S. Dissanayake, 2015. “Effectiveness of Retro-Reflective Signal Backplates as a Countermeasure to Reduce Red-Light-Running Violations.” In Transportation Research Board 94th Annual Meeting. Washington, DC: Transportation Research Board. https://trid.trb.org/view/1336602

I. Dias and S. Bandara, 2013. “Development of an evaluation criterion to assess pedestrian facilities in urban environments,” in 54th Annual Transportation Research Forum (TRF), p. 187.

• I. Dias and S. Bandara, 2011. “Evaluation of pedestrian facilities in urban environments using “Walkability Measures,” in International Conference on Advances in Highway Engineering & Transportation Systems (ICAHETS), p. 19
• T. W. K. I. M. Dias and J. M. S. J. Bandara, 2010. “Contribution of a Walkable Community towards Saving Energy,” in Proceedings of the International Forestry and Environment Symposium, p. 89
• T. W. K. I. M. Dias and J. M. S. J. Bandara, 2010. “Develop an Evaluation Criterion to Assess Pedestrian Facilities in Urban Environments at Micro Level,” in Transport Research Forum. Mt Lavinia: University of Moratuwa.

Posters

• I. Dias, 2015. “Crash Severity in Work Zone Crashes in Kansas.” In 2015 Midwestern ITE Annual Meeting. Branson, Missouri.
• I. Dias and S. Dissanayake, 2015. “Effectiveness of Retro-Reflective Signal Backplates as a Countermeasure to Reduce Red-Light-Running Violations,” Poster at Transportation Research Board 94^th Annual Meeting. Washington, D.C., doi: 10.13140/RG.2.2.10489.39525
• I. Dias, 2014. “Evaluating the effectiveness of retroreflective signal backplates in reducing red light running violations,” 2014 ITE Midwestern District Meeting. Rapid City, South Dakota, doi: 10.13140/RG.2.2.11927.62882.
• I. Dias, 2013 “Evaluation of the effectiveness of shoulder rumble strips towards reducing roadway departure crashes,” Poster at ITE Midwestern District Annual Conference. Milwaukee, Wisconsin, doi: 10.13140/RG.2.2.24510.54087

Podium Presentations and Invited Talks

• “Vulnerable Road User Safety” January, 2021. (Invited) Webinar Series on Road Safety organized by the Chartered Institute of Logistics and Transport (CILT) held online via Zoom (Recording Available)
• “Protecting children from road crashes”, March, 2019. (Invited) Workshop on Road Safety Organized by Sri Lanka Association for the Advancement of Science (SLAAS) in collaboration with the Chartered Institute of Logistics and Transport (CILT). At Vidya Mandiraya, Colombo, Sri Lanka (Newspaper Article Available)
• “Comparison of Nighttime and Daytime Crash Characteristics Associated with Severity of Work Zone Crashes Using Severity Models.” 2015 Mid-Continent Transportation Research Symposium. Ames, Iowa, USA
• “Evaluating Retro-Reflective Signal Backplates in Reducing Red Light Running.” 2015 97th Kansas Transportation Engineering Conference at Kansas State University. Manhattan, Kansas: Kansas State University
• “Evaluation of the characteristics of red-light running crashes and comparison with other intersection crashes,” 2014 at Kansas Research Forum. Manhattan, KS, Apr. 2014. (Presentation Slides Available)

1. Chartered Member: Chartered Institute of Transport and Logistics (CILT)
2. Associate Member: Institute of Engineers Sri Lanka (IESL)
3. Life Member: Highway ENgineering Society Sri Lanka (HES)
4. Life Member: Sri Lanka Association for Advancement of Science (SLAAS)
5. Life time Member: Sri Lanka Evaluation Association (SLEvA)