Impact of interest rates of bank loans on road construction: the case of Sri Lanka

Purpose - Infrastructure systems play a dominant role in the economic growth of countries. Projects involved with the construction of roads, which is vital for the development of a country, are financed mainly using borrowed funds because of the reliability of debt financing. The cost of borrowing is the interest that has to be paid. In Sri Lanka, there is a high tendency for interest rates of bank loans to fluctuate, and this makes the road projects in the country that are funded with borrowed money to be highly risky. Thus, this paper aims to identify the impact of bank loan interest rates on road construction in Sri Lanka. Design/methodology/approach - The study consisted of two questionnaire surveys conducted among financial specialists and road construction experts, followed by a documentary review. The collected data were analysed using Relative Importance Index. The relationship between the interest rates of bank loans and the prices of the resources used in road projects were determined using regression and correlation analyses. Findings - The research revealed a strong, linear relationship between interest rate fluctuations and bitumen, aggregate base course, metal and earth price fluctuations. It also identified the pattern of interest rate fluctuations to help practitioners to predict the pattern of input price variations. Originality/value - When developing the capital structure of road projects, it is necessary to consider the prices of materials used in the projects when determining the financial risks of debt financing.