Conceptual Approach for Estimating Dynamic Passenger Car Units on Urban Arterial Roads by Using Simultaneous Equations

Dhamaniya, Ashish; Chandra, Satish

doi:10.3141/2553-12

Cited by 21 publications

(4 citation statements)

References 16 publications

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“…The result showed that the queue and composition of the queue affect the PCU. Dhamaniya and Chandra ( 36 ) gave the conceptual approach for determining the dynamic PCU using the simultaneous equations of speed. Authors found the range of PCU values from 1.47 to 1.65 for big cars and 5.51 to 6.54 for heavy vehicles, depending on their proportions in the stream.…”

Section: Development Of Headway-based Toll Equivalency Factorsmentioning

confidence: 99%

Development of Toll Equivalency Factors for FASTag Lanes Under Mixed Traffic Conditions

Bari

Chandra

Dhamaniya

2022

Transportation Research Record: Journal of the Transportation R

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The traffic conditions in India consist of a high degree of heterogeneity in vehicle categories plying on the highways without any lane-following behavior. A similar behavior is observed at the toll plazas where a dedicated lane assigned to a vehicle class is encroached by the vehicles of other categories, causing a mixed nature of the traffic in the same lane. In the present study, service headway is taken as the measure of effectiveness for studying the effect of mixed traffic conditions on traffic operations at electronic toll collection system (ETC) lanes, which are called FASTag lanes in India. Service headway is composed of processing time and the clearance time of the vehicle. Videographic data were collected at three different toll plazas located on National Highways in India to capture the variability in traffic and human behavior. The results showed that the service headway for a vehicle varies between 1.56 s and 34.40 s. The service headway-based toll equivalency factors (HTEF) are developed for converting the mixed traffic flow into a homogeneous equivalent for FASTag lanes. The results showed that the HTEF varies from 1.01 to 2.61. The results are validated spatially with data taken from a different site, and no significant difference was found between both the converted and equivalent data. Field engineers can use the developed HTEFs to estimate the traffic flow in equivalent terms based on the traffic composition. Further, the present study results can also be used to study the capacity and level of service (LOS) of FASTag lanes.

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Section: Development Of Headway-based Toll Equivalency Factorsmentioning

confidence: 99%

Development of Toll Equivalency Factors for FASTag Lanes Under Mixed Traffic Conditions

Bari

Chandra

Dhamaniya

2022

Transportation Research Record: Journal of the Transportation R

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“…The traditional flow and density need extra information like composition that defines the properties of vehicle classes in the traffic stream. To overcome this, passenger car equivalent (PCE) [15]- [19], area defined density [20], [21], and AO [22] concepts were developed. Multi-class models have been proposed as an alternative to traditional density measurements to address the challenges of PCE [23]- [25].…”

Section: Introductionmentioning

confidence: 99%

Empirical Investigation of Fundamental Diagrams in Mixed Traffic

Maiti

Chilukuri

2023

IEEE Access

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A thorough understanding of the fundamental relation of traffic flow variables is critical for the efficient operation of traffic systems. However, their relationships in mixed traffic are challenging to model due to the continuously changing vehicle composition. This paper proposes a composition-based approach for estimating the fundamental relationships between traffic flow variables using empirical data. The methodology seeks to eliminate the difficulties in class-specific ss identification by introducing a continuous wavelet transformation with oblique cumulative arrival and oblique occupancy time plots. We used machine learning (ML) algorithms to delineate regimes and showed the fundamental diagrams for a given location that has a composition-invariant free-flow branch but has distinct composition-specific branches in congestion. Also, it was observed that the congested regime (CR) has a wide scatter indicating possible stochastic inter-class interactions for varying vehicular composition. We proposed a distance optimization method to re-cluster the CR data and found that the proposed method improves the fit with the empirical observations. The inter-class interactions result illustrates that the heavy vehicles will dominate the high-speed vehicles with the increase of AO. It is found that beyond a critical level of AO in congestion, all vehicle class travel at the same speed. Finally, it is found that validation with different datasets shows that the proposed methodology is robust in estimating fundamental diagrams under mixed traffic conditions.

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“…Table7indicates that the PCU values obtained in this study for Motorcycles and Three-Wheelers are slightly lower than the existing ones. Dhamaniya & Chandra[18] studied that the increase in volume to capacity (v/c) ratio of smaller vehicles than cars cause a decrease in their PCU values. If one were to put this argument forward, having a higher (v/c) ratio on the selected midblock sections at present compared to the past supports it.…”

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confidence: 99%

Passenger car units for different midblock sections in Sri Lanka under mixed traffic condition

et al. 2023

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Traffic-related analyses are essential to implementing traffic management approaches to create mobility more convenient. In this context, Passenger Car Unit (PCU) values as a uniform measure of vehicles are instrumental in analysis such as traffic capacity estimation, traffic flow model development, level of service determination, etc. These studies always demand a recently calculated set of PCU values since the traffic conditions in arterials often change. PCU values for expressway and three-lane (one-way) road types have not been calculated in the Sri Lankan context, and the available set of values has become somewhat outdated. Hence, this study used Chandra's method to assess the PCU values of ten vehicle categories for four different mid-block road sections in the Colombo district, Sri Lanka. The data relating to the two main variables of this method, categorical speed, and area of vehicles, were collected from field surveys. The results of four-lane arterials were aggregated and compared with the existing PCU values, intending to propose an updated set for general transportation studies in Sri Lanka.

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Conceptual Approach for Estimating Dynamic Passenger Car Units on Urban Arterial Roads by Using Simultaneous Equations

Cited by 21 publications

References 16 publications

Development of Toll Equivalency Factors for FASTag Lanes Under Mixed Traffic Conditions

Development of Toll Equivalency Factors for FASTag Lanes Under Mixed Traffic Conditions

Empirical Investigation of Fundamental Diagrams in Mixed Traffic

Passenger car units for different midblock sections in Sri Lanka under mixed traffic condition

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