Browsing by Author "Jayalath, GR"

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    item: Conference-Abstract
    Characterization of potential demand for etc usage along E03 highway in terms of socio-demographic parameters of non-etc users - a case study from Sri Lanka.
    (Sri Lanka Society of Transport and Logistics, 2019-09) Jayalath, GR; Chethani, YDS; Gunaruwan, TL
    During the planning stage of the Colombo – Katunayake Expressway (E03) it was presumed that gradual replacement of Manual Toll Collection (MTC) gates with Electronic Toll Collection (ETC) gates will be an effective strategy to maintain design throughputs via all tollbooths during the E03’s design life. Accordingly, one MTC gate per plaza was converted to an ETC gate to start with, and toll collection using the ETC system commenced in July 2015. Since then an unexpected phenomenon occurred: i.e., despite four years having passed, only 4,355 users had so far taken ETC tags - just 17.8% of the total daily E03 throughput of 24,360 users. Poor throughputs via ETC gates resulted in long queues at manually operated gates (MTC). Despite many attempts during the last four years, authority has so far been unable to have the expected throughputs via ETC gates. Today it has become common for MTC users to queue for toll payment - with wait time during rush hours exceeding travel time on the E03. These circumstances warranted authorities to explore alternative means of addressing this issue. Accordingly, it was decided to carry out a socio-demographic survey of MTC users with the objective of identifying variables that would have influenced MTC users’ decisions on the purchase of ETC tags. This study revealed that this decision is related to both socio-demographic variables and socio-economic variables as well as to the regulatory framework on issuance. Findings of this study will inform the formulation of an evidence-based toll policy in Sri Lanka.
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    item: Conference-Abstract
    Extent of concerns over human limitations in existing road design standards – a literature review over the “status of adequacy”
    (Department of Civil Engineering, University of Moratuwa., 2015) Jayalath, GR; Pasindu, HR
    Analysis of technically unexplainable accidents has confirmed that accidents could occur not only due to the user misbehaviors but also due to the lack of purpose designed field of vision including road courses without adequate contrast to increase alertness. These findings imply that without a comprehensive understanding of the human limitations a self explaining road design with low accident risk cannot be achieved. Our current design standards need to be systematically improved to integrate principals of spatial perceptions in order to manage user needs and expectations. In the context of Sri Lanka and of many Asian countries user misbehaviors certainly the most significant contributory factor for the alarming accident rates they experience at present, yet the fact that lack of purpose designed field of vision though would be secondary, certainly will aggravate the end repercussion of a misbehaved user. The duration taken by an average driver to adapt from one traffic situation to the next or to adjust to a new environment is much longer than the standard reaction time duration between 2.0-2.5 seconds stated in most of the current design standards. This is particularly so when information is difficult to find or when users are confronted, with situations demanding complex decisions. A critical review of pertinent research and related provisions within road design standards of US, Canada and UK has revealed that concerns over human limitations have not yet been satisfactory incorporated in to the standards (G. KANELLAIDIS, 1997) [3].Birth S IBYLLE, 2013[4] reviewed design standards of nine western countries and found that none of the standards explicitly considers the aspects related to the management of field of vision of drivers. This paper submits a comparison of “extents of considerations” of human factor concerns over the geometric design standards of Sri Lanka, with other standards including AUSTROADS[2], AASHTO[1] & Chinese based on findings of previous studies. At the end a framework is discussed allowing the integration of human aspects related to the management of field of vision of road users into the geometric standards of Sri Lanka.
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    item: Conference-Extended-Abstract
    Post evaluation (ex-post) of financial sustainability of toll road E03: a Sri Lankan case study
    (Sri Lanka Society of Transport and Logistics, 2018-06) Jayalath, GR; Gunaruwan, TL