Abstract
"ENGINEER", established in 1973 by The Institution of Engineers, is a Journal for dissemination of Engineering knowledge, published quarterly.Cover DescriptionCover images show a schematic diagram of a Pumped-Storage Hydroelectricity (PSH) facility and one of the promising sites for PSH in Sri Lanka. The latter image was obtained from the publicly available JICA report on “Development Planning on Optimal Power Generation for Peak Demand in Sri Lanka”. The Institution of Engineers, Sri Lanka acknowledges JICA for the image.If you are interested in contributing an Original Technical Paper based on research by the author(s) (intended for Section I) or an Original Article of Professional or Technical interest related to Engineering. (Section II) to this journal please go through the publication checklist which can be downloaded from here.
Highlights
Major operational problems associated with two lane two-way roads are passing delays due to speed differences between fast and slow moving vehicles and turning delays
The unique operational characteristic of two lane two way highways is that overtaking is only possible when there is a gap in the opposing traffic lane
Highway Capacity Manual (HCM, 2000) identifies Average Travel Speed (ATS) and Percentage Time Spent in Following (PTSF) as the two major determinants of Level of Service (LOS).which is a measure of the service quality of a facility
Summary
Major operational problems associated with two lane two-way roads are passing delays due to speed differences between fast and slow moving vehicles and turning delays. In two lane two way highways speed differences are greater due to several factors They are, presence of heavy vehicles in the main traffic stream, local traffic, road geometry, driver characteristics etc. Counter measures described in this paper are not meant only for new roads and for existing two lane two-way highways These solutions could be applied on existing roads in order to improve operational problems. These are widely being adopted in existing rural state highways in New Zealand and other developed countries. The author believes the discussion of the subject is timely as engineers need to articulate to different operational problems in two lane two-way highways
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