Browsing by Author "Chinthanie, RPD"

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item: Thesis-Abstract
Accident analysis of Southern expressway
Chinthanie, RPD; Mampearachchi, WK
Southern Expressway, the first ever access controlled expressway in Sri Lanka, was opened for traffic to function in year 2011. Even though it has provided several safety precautions, about 2000 number of accidents have been reported during the last three and half years (2011-2013). Therefore, identifying reasons for the accidents and critical locations where majority of accidents have taken place are essential for introducing immediate safety improvements. Main objectives of this research are to identify accident-prone locations, identify possible reasons for the accidents, and calculate the accident rate based on vehicle travel kilometre. According to this research study, ten most critical accident-prone locations were identified in the Southern Expressway from Kottawa to Pinnaduwa section. Accident locations were grouped into nearest 100m distance and the ten most critical locations are 0+100 km, 5+800km, 5+900km, 8+000km, 22+100km, 27+800km, 55+300km, 58+800km, 64+800km, and 65+100km. Main causes of the accidents, as per the accident records, are the driving speed and poor road environment under rainy weather (slippery road condition). Driver fatigue also act as a key factor for some accidents. Accidents happened during night time are twice higher than that of day time. However, this trend was same in each of the section along the road. Eventhough the highest accident rate of around 3.00 x 10-6veh km was noted from Kottawa-Kahathuduwa section and Baddegama-Pinnaduwa section, accident rates in each section have reduced from year 2012 to 2013.When comparing Southern Expressway with Colombo-Wellawaya road (A2) road corridor from Moratuwa to Galle in year 2012, Southern Expressway shows higher accident rate (2.4 x 10-6 per vehicle kilometre travelled) than other corridors (1.86 x 10-6 per vehicle kilometre travelled). In addition, fatality rate in Southern Expressway has increased from 2012 to 2013, which is considerably a higher value than fatality rates of road accidents in most of the other countries. However fatality rate in southern expressway has a low value than relevant figures in A2 road and whole Sri Lanka.
item: Conference-Abstract
Identify possible reasons for accident occurred in Southern Expressway
(Department of Civil Engineering, University of Moratuwa., 2014-08) Chinthanie, RPD; Mampearachchi, WK; Pasindu, HR
Southern Expressway, the first ever access controlled expressway in Sri Lanka was started to function in year 2011.Total road length from Kottawa to Pinnaduwa is 126 km and there are eleven interchanges within that length. Government of Sri Lanka is expecting lots of benefits through this expressway. Safety consideration is essential in any of the road project. Even though there is several safety precautions are provided, about 1100 number of accidents have been reported up to now. Since “expressways“ is a new topic for Sri Lanka , perception about it will be bad due to this and discourage the road users. Therefore identifying possible reasons for the accidents and accident prone locations is essential to provide immediate safety improvements. Main objectives of this research are identifying accident prone locations, identifying possible reasons for the accidents and calculate the accident rate based on the vehicle travel kilometre. It could be identified the nine number of most critical accident prone locations and by detail analysis of those prone locations found out the possible reasons for the accidents. In addition to that since the traffic data is reported daily it could be find out the accident rate based on the accident travel kilometre which is more accurate than other methods to calculate accident rate. Road user and the road environment are the two key factors contributed for the accidents based on the accident data of the Southern Expressway collected from the Road Development Authority and Sri Lanka Police. Since it is very difficult to carryout accurate analysis for the contribution of road user with the recoded accident data, this study was mainly targeted on the second important factor, road Environment to the accidents. According to the analysis it could be concluded as there is a higher possibility to occur accidents during rainy weather under the slippery road condition. In addition, driver fatigue was identified as a contributory factor for accidents of long distance travellers (travelling distance is more than 40 km).