Analysis of effective indicators and determination of different Passenger Car Equivalent in the main roads of Iran

Document Type : Original Article

Authors
Shahriar Afandizadeh 1
Kiomars Mohammadi 2
Bigdeli Rad Hamid 3
1 Professor, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
2 M.Sc., Student, Islamic Azad University, Science and Research Branch, Tehran, Iran.
3 Ph.D., Candidate, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
10.22034/road.2023.400836.2173
Abstract
Millions of vehicles are moving on the roads worldwide, and billions of dollars are spent each year to meet transportation needs as the main artery of the world economy today. The role of the road and, consequently, asphalt as a factor in accelerating movement and reducing depreciation costs is undeniable. The investigation of various methods used to determine the passenger car equivalent (PCE) indicates that most of these methods are focused on traffic characteristics affected by the presence of heavy vehicles. The most important of these parameters are traffic speed and the formation of a group of vehicles along the route, the speed of heavy vehicles, especially on steep slopes, the dimensions of vehicles, and the maneuvering capabilities of these vehicles in reducing and increasing slope, which are among the parameters used in determining the PCE. This study aims to analyze effective indicators and determine the PCE of various vehicles on the main roads of the country. The results show that the PCE for two-axle trucks and minibusses have the lowest coefficients among heavy vehicles. After that, the coefficients increase in the order of buses, two- and three-axle trucks, some vehicles, two-part heavy vehicles, and four-axle trucks and above. This order has been observed in different topographic conditions, different slopes, and different volumes.
Keywords
Passenger Car Equivalent (PCE)
Transportation
Main Road
Road Capacity
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