Passenger car equivalency (PCE) values provide a basis for estimating capacity of roadway and its elements such as signalized and unsignalized intersections. The present study aims to provide a novel framework to estimate dynamic PCE values for various vehicle classes under mixed traffic conditions for roundabouts. The data was collected and analyzed for the roundabout located in Chanakyapuri, New Delhi, India. In this study, PCE values of a particular vehicle class were estimated using entry versus circulating flow curves and a rational mathematical equation. Systematically calibrated VISSIM simulation tool helped in developing capacity curves for different vehicle proportions. With the help of entry capacity values for each approaching road, PCE values were obtained by comparing the car only flow with vehicle under consideration. Results show that PCE values are sensitive to traffic volume and composition. It is also observed that the PCE value increases with increase in opposing flow and vehicle proportion. For motorized three wheelers, PCE value exceeds one at high-circulating flow conditions as well as for larger proportion of motorized three wheelers in road traffic. The PCE value of motorized two wheelers varies from 0.34 in free flow condition to 0.7 in congested condition. It is noticed that the estimated PCE values of two wheelers do not differ much when compared to the past results. In heavy vehicles scenario, PCE values are inflated at high-circulating flow. This is due to their slow acceleration and deceleration characteristics.
Dynamic Passenger Car Equivalency Values for Multilane Roundabouts Under Mixed Traffic Conditions—A Case Study
Lecture Notes in Civil Engineering
Recent Advances in Transportation Systems Engineering and Management ; Chapter : 5 ; 67-80
2022-11-11
14 pages
Article/Chapter (Book)
Electronic Resource
English
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