Wijesinghe, S.A.D.M.D.A.2017-01-112017-01-112016Wijesinghe, S.A.D.M.D.A. 2016. Evaluating the impact to travel time by Expressways in Sri Lanka Colombo – Katunayake Expressway. National Research Conference on Applied Social Statistics, Social Statistics Students’ Association, Department of Economics, University of Kelaniya, Sri Lanka. p 82.http://repository.kln.ac.lk/handle/123456789/15859enArticle