The national road network of Sri Lanka (Class A and Class B road network) serves 80% of the island‟s road traffic [1] and these national roads have been prime agents for road accidents [2]. The cluster of national roads inside the Western Province connecting a majority of socioeconomically active locations of the country, has the highest demand from both passenger and freight movements which has caused simultaneous increases in congestion and safety problems during the recent past [3]. Under the above circumstances, this research was conducted as an attempt to develop relationships between number of road accidents and road infrastructure improvements to predict the need of infrastructure improvements of the near future, in order to proactively direct the infrastructure providers. The study was carried out on a 20 km road segment with a high traffic demand and a high frequency of accidents on the A4 road, inside the Colombo District of the Western Province as a case study targeting 25 hazardous locations that were identified and validated through maps plotted with historical data on road accidents from 2010 to 2014 [3]. The SICRS [3] had identified both the hot-spots (congested road sections) and the black-spots (accident prone road sections) separately on A4 road. It had recommended to the Road Development Authority (RDA) possible solutions to mitigate existing problems when improving the road by the end of the year 2014. The RDA having performed two consecutive widening and improvement projects on the studied length of the A4 road from 2010-2013 and 2013-2015, the objective of this study was to identify a relationship among traffic volumes, road accidents and the road infrastructure improvements.

Nalaka, C., & Sivakumar, T. (2016). Development of relationships between traffic volume, number of accidents and road infrastructure improvements [Extended Abstract]. In T.L. Gunaruwan (Ed.), Proceedings of 1st International Conference on Research for Transport and Logistics Industry 2016 (pp. 71-73). Sri Lanka Society of Transport and Logistics. https://slstl.lk/r4tli-2016/