Dwell time was measured as the time a public transit vehicle spends at its scheduled bus stop for passenger boarding without moving, which is one of the main determinants of service quality of public transportation [1]. Long dwell time causes many problems for passengers, public transport operators and environment. A bus route (Route No 255), between Mount Lavinia and Kottawa which is one of the bus routes with the highest demand in Moratuwa with a frequency of 300 buses per day was selected as the case. Katubedda junction being a major transfer point between two roads was selected as a case to study dwell time. The objectives of this research were to identify: (a) the present practice of dwell time, (b) passenger perceptions about longer dwell time and (c) the rationale of users' mode choice.