Browsing by Author "Amarasingha, N."

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Embargo
An analysis of signalized intersections: Case of traffic light failure
(Faculty of Graduate Studies and Research, 2017-01-26) Mohamed Mafas, A.M.; Amarasingha, N.
Traffic congestion due to failure of traffic lights is one of the problems in Colombo. To study traffic congestions due to failure of traffic lights, the traffic characteristics at intersections should be investigated. Capacity of the intersection is the main factor influenced for congestions. Data were collected at three intersections Malabe, Battaramulla and Rajagiriya and capacity of each identified. The capacity of each intersection was studied according to the Peak Hour Malabe and Rajagiriya had PHF of 0.95 and Battaramulla had the value of 0.91. Accordingly, the effective simple suggestions to manage these intersections may be introduction of telephone booth and police cabin to use the case of emergency.
Open Access
The effect of roadside elements on drivers' speed selection and lateral position on road
(Faculty of Graduate Studies and Research, 2017-01-26) Lankathilake, T.N.; Amarasingha, N.
Highway related crashes are considered as one of most concerned types of problems in the modern world. Run-Off-Road (ROR) crashes could be identified as the most critical among highway related crashes. Previous research studies on Traffic Engineering has found that the road side elements will have a positive influence toward ROR crashes. Hence, the study explores the relationship of roadside elements with drivers' speed selection and lateral position. In this research study, the effect of road side vegetation and utility poles on drivers' speed selection and lateral positioning was evaluated. A straight roadway section and horizontal curve roadway section with varying road side vegetation were selected to get the required data for the study. Fifty vehicle were observed at each location to get the speeds and lateral positions. Collected data was analyzed using Multiple Regression Analysis technique to generate models to find drivers' speed selection and lateral positioning of vehicle on road. Study found that in lightly vegetated roadways, subjects drove speedier and drove much near the edge of the road. At the point when the scene changes into more vegetated, subjects drove much slower and drove near to the center of the road. The models demonstrate that the impact of road side vegetation way much higher in curved roads areas than straight segments. Therefore, it is recommended to post a speed limit sign and proper monitoring system at each critical curved roadway section in the country.
Embargo
Estimating the fuel loss during idling of vehicles at signalized intersections in colombo
(Faculty of Graduate Studies and Research, 2017-01-26) Amarasingha, N.; Alwis, L.N.V.
The fuel consumption of the vehicles is increasing day by day as a result of enhanced trip lengths, personal mode of transport, and congested intersections. The drivers normally keep their vehicle engine on while waiting for their turn to cross the intersection at signals, and a result of this extra fuel is consumed. This small amount of fuel wastage becomes a huge quantity when aggregated over number of cycles per day and number of signalized intersections. This study was carried out in Colombo, commercial capitals of Sri Lanka. For estimating the excess fuel consumed by vehicles during idling at signalized intersections, two signalized intersections with medium traffic volumes were considered. The selected signalized intersections were Borella and Narahenpita. The primary data for this research study, traffic volume and idling delay were obtained through field surveys. Required vehicle idling fuel consumption data were obtained from previous research. It was observed that the presence of heavy traffic congestion at the signalized intersections was the main reason for huge amount of fuel wastage from the vehicles. After the implementation of remedial measures, which are suggesting in this study, fuel loss during idling of vehicles at the signalized intersections can be reduced.
Open Access
Estimation of vehicle kilometers travelled in southern province, sri lanka
(Faculty of Graduate Studies and Research, 2017-01-26) Weerasekera, T.D.; Amarasingha, N.
Estimation of vehicle kilometers travelled (VKT) is used in traffic and transport planning for various purposes such estimating the emissions, estimating energy consumption, analyzing crashes, assessing traffic impact, and making road safety policy. Therefore, it is crucial to have an accurate timely estimation of VKT. Both traffic and non-traffic measurement methods are popular among the transport planners and researchers. Very few studies have conducted in Sri Lanka for estimating the VKT. This study proposes to estimate the VKT based on the number of household daily trips, which are collected through the interviews. The interviewer records the mode of travel, total number of kilometer travelled, and number of passengers. The socio-demographic information is also collected and this includes age, gender, employment status, income and residential area. The estimation of total VKT are derived from survey respondents' total number of kilometers each travelled during the previous 12 months in Southern Province, Sri Lanka. The collected data are also used to estimate the personal kilometer travelled and characteristics of travelers in Southern Province.
Open Access
A study on pedestrian crossings in colombo suburbs
(Faculty of Graduate Studies and Research, 2017-01-26) Amarasingha, N.; Mallawaarachchi, C.E.
A pedestrian crossing is a location on a street which is designated for pedestrians to cross streets. According to the National Council for Road Safety (NCRS), more than 900 fatalities have occurred due to the crashes on or near pedestrian crossings during past 10 years in Sri Lanka. However, little research has been carried out in this regard. This study identified issues related to design of pedestrian crossings in Colombo area through observations and interviewing both road users and law enforcement authorities. This study highlights issues related to pedestrian crossing designs and give recommendations in accordance with international standards to make them safe for all road users.