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Tufail, M. , Hussain, J. , Hussain, H. , Hafeez, I. , Ahmad, N.. "Analysis of Rural Roads in Developing Countries Using Principal Component Analysis and Simple Average Technique in the Development of a Road Safety Performance Index". World Academy of Science, Engineering and Technology, Open Science Index 171, International Journal of Transport and Vehicle Engineering, (2021), 15(3), 120 - 127.