Browsing by Author "Kandambi, KW"

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item: Conference-Abstract
Criteria to identify optimum spacing for service areas on Southern expressway extension
(Department of Civil Engineering, University of Moratuwa., 2017-07) Kandambi, KW; Bandara, JMSJ; Pasindu, HR
Many of the accidents happened in Expressways is due to the fatigue and sleepiness of the drivers. In the Southern Expressway, there is only one service area for the entire 142km distance which will be a relief for the long-distance drivers due to non-availability of any other rest area. The research overview is analysing the effectiveness of the existing service area located in Southern Expressway with collected traffic data over a one week period. Analysis carried out in order to identify the number of vehicles stopped at the service area. Several statistical and graphical methods were used to obtain the distribution of operating speeds in each of the expressway section and categorized as vehicles stopped at the service area considering the average speed. The accuracy of the results can be increased with a vehicle survey at the service area. However, categorization according to the speed is more convenient as comparison carried out with several criteria. The main objective of the research is to identify the optimum spacing for the service areas of Southern Expressway and finding the suitable location for the proposed service area in Southern Expressway extension. In order to show the usage of an effective service area, a standard was developed. The number of possible criteria was identified which could be influencing the driver to use the service area and those criteria were weighted by comparing with the standard and the traffic data analysis. Then weighted factor was applied to the distance between service areas and selected interchange and adjusted to obtain an optimum value for the spacing between two service areas which will help to find the suitable location for the proposed service area in Southern Expressway Extension.
item: Thesis-Full-text
Criteria to identify optimum spacing for service areas on Southern expressway extension
(2018) Kandambi, KW; Bandara, JMSJ
Southern Expressway is the first E class highway in Sri Lanka currently spanning from Kottawa to Godagama. This expressway is 126.1 kilometers long from Kottawa to Godagama. In most expressway projects, service area which will serve passengers is common. From Kottawa to Godagama there is one service area located at Welipenna. Southern Expressway extension will extend the expressway from Matara to Hambanthota including Expressway link to Mattala. From Welipenna to Hambanthota, there is approximately 177 km. So, it is evident that there needs to be additional rest areas located in the southern extension project. Service area is an integral part of a long expressways. Purpose of the service area in an expressway is to provide services to the passengers and provide a resting place for the drivers in their long journey. Placing of the service area is very important because it will affect the accident rate in expressways. In this research using traffic data collected which include the vehicle entrance time and date to the expressway, exit time and date from the expressway, vehicle type, entered interchange and exit interchange from existing southern expressway, location for a service area is proposed by calculating the optimum distance between the service areas. Quantitative data gathered from the expressway is analyzed to obtain a criteria for deciding the optimum location for the service area of the expressway extension. According to the findings 60km was proposed for distance between service areas and 30km was proposed as the distance between the rest areas.