Impact of Geometric Characteristics on Capacity of Hill Roads

Understanding the impact of geometrical features such as gradients, sharp curves, sight distances, etc. on the capacity of hill roads is crucial for efficient and safe traffic operations. This study aims to provide a comprehensive analysis of the influence of geometrical characteristics on the capacity of hill roads. By rigorously collecting and analyzing extensive data, this study investigates the correlation between diverse geometrical factors and road capacity. Data was collected from four different stretches on the Rishikesh-Badrinath Highway (NH-7), representing different topographical and geometrical conditions. The study also investigates potential interactions and the relationships between these factors. The findings highlight the critical role played by geometrical characteristics in determining road capacity on hill roads. Steeper gradients, sharper curves, and restricted sight distances were found to have a substantial negative impact on capacity. Additionally, the study investigates the estimation of capacity loss while negotiating from the tangent to the curved section of the hill road. The research provides valuable insights into the relationship between tangent gradient, capacity loss, and curve radius, which can aid in the design and planning of hilly roads. The findings highlight the importance of considering the effects of gradient and curve radius on road capacity.