• Khan Abdul Basit
• Irfan Amin Bhat

Safety on rural highways is of great concern as nearly two third of road fatalities are found to take place on such roads. High speed of vehicles is the characteristic of rural highways. Geometry is one of the factors that control the speed of vehicles and consequently, the crash occurrence. A highway design can be evaluated based on consistency in geometry. Operating speed is the measure adopted for consistency evaluation in this study. The objectives of this study are to develop operating speed models for different classes of vehicles at middle of the horizontal curve and operating speed reduction models from preceding tangent to the horizontal curve and then use criteria developed by researchers for evaluating the geometric design consistency on two lane rural highways. Operating speed deviation from design speed at the middle of curve and operating speed reduction from preceding tangent to the curve are the consistency measures used in this study. These criteria can be used to evaluate the curve as a single element, and as successive elements. Alignment can then be classified as good, fair or poor using these criteria. Using operating speed deviation criteria, 69.7% curves were found to have good consistency for light vehicles and 100% curves were found to have good consistency for heavy vehicles on the selected road stretch. Using speed reduction criteria, 14% curves were having good consistency for light vehicles and 11.6% curves were having good consistency. Keywords: Operating speed, design consistency, horizontal cure, radius of curve, deviation angle of curve.

"Study on Geometric Design Consistency of Horizontal Curves on Two-Lane Undivided Non-Urban Roads under Heterogeneous Traffic Conditions", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.638-644, June-2019, Available :http://www.jetir.org/papers/JETIR1906M96.pdf

"Study on Geometric Design Consistency of Horizontal Curves on Two-Lane Undivided Non-Urban Roads under Heterogeneous Traffic Conditions", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp638-644, June-2019, Available at : http://www.jetir.org/papers/JETIR1906M96.pdf