Impact of Side Friction on Saturation Flow at Signalized Intersections in Mixed Traffic Conditions

Saturation flow rate is the prime important parameter for the design of capacity of signal-controlled intersections. The width of the approach is one of the most important factors for the evaluation of saturation flow. But, in countries like India, due to the increase in commercial and social land usage, especially on roadsides, there are many factors that affect road width performance, among which side friction is one of the most important factors. In the present research study, an attempt is made to find the impact of side friction on saturation flow at signalized intersections in mixed traffic conditions. For this purpose, the data was collected from four different cities: Hyderabad, Hanmakonda, Raipur and Calicut. A multiple linear regression model is developed for estimating saturation flow in the present study. In addition to the saturation flow model, the present work provides adjustment factors for side friction to calculate saturation flow.