Comparative Study of Methods Used for a Capacity Estimation on Two Lane Undivided National Highways

Vijay, B G; RajendraKhatavkar,

doi:10.17265/2328-2142/2019.01.004

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…An examination of the previous studies on the capacity of two-lane roads reveals that these studies have primarily concentrated on three key aspects: LOS and capacity, platoon changes, and time headway and spacing headway. In the frst group of the aforementioned studies, several research works have investigated the infuence of various parameters, such as the number of platoons formed by vehicles [11], the HV [12][13][14] [15], the NFPC [16,17], speed of followers and critical H t as functional characteristics [18,19], the PTSF and the ATS [20][21][22], geometric parameters (longitudinal slope and superelevation of the road) [23,24], geometric features of the road and trafc conditions (density, speed, and the trafc fow rate) [25][26][27], and density [28] and travel speed using passenger car equivalent [29] on the LOS and road capacity.…”

Section: Literature Reviewmentioning

confidence: 99%

Platoon-Based Assessment of Two-Way Two-Lane Roads Performance Measure: A Classification Method

Samadi

Aghayan

Nasiri

et al. 2023

Journal of Advanced Transportation

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Two-way two-lane roads have a significant impact on road transportation infrastructure. Platoon formation on two-lane roads is one of the factors that affect the quality of traffic flow on two-lane roads. More specifically, the creation of a platoon increases the density of vehicles and the number of overtaking maneuvers and decreases the traffic performance of two-lane roads. The present study made an effort to investigate the effect of the platoon characteristics on the traffic flow of vehicles on two-lane roads. Moreover, it strived to develop the nonlinear regression model with a new approach to capacity calculation. Finally, a method for estimating the level of service (LOS) based on the number of followers per capacity (NFPC) and LOS classification using the KNN method was presented. Considering these aims, first, the relevant variables (which were related to platoon) including time headway (Ht), average travel speed (ATS), platoon size (PS), average platoon speed (APS), percentage of heavy vehicles (HV), percent time spent following (PTSF), number of overtaking (NO), density (ρ), and traffic flow were investigated on the examined roads. The results showed that the speed and the Ht were the most effective and the least effective platoon characteristics, respectively. Moreover, it was accompanied by the increase in PTSF which resulted in the increase in overtaking maneuver. Finally, the results regarding the developed model showed that the NFPC measure was able to predict the traffic flow of two-lane roads in a more satisfactory way compared to the two criteria, namely, PTSF and ATS in the Highway Capacity Manual (2016) since it increased ATS by 65% and decreased the capacity of two-lane roads by 21%.

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Section: Literature Reviewmentioning

confidence: 99%

Platoon-Based Assessment of Two-Way Two-Lane Roads Performance Measure: A Classification Method

Samadi

Aghayan

Nasiri

et al. 2023

Journal of Advanced Transportation

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“…Many researchers have developed different techniques to find PCU value for different class of vehicles. However Chandra's method is the only method that can be applied to Indian mixed traffic flow characterized by less lane discipline hence, adopted in the present study [19].…”

Section: Determination Of Passenger Car Unitmentioning

confidence: 99%

“…11. Similarly, the mean stream speed at which the maximum flow/capacity value occurs on a particular section of the highway with change in carriageway width was drawn for other sections also, and the values are tabulated in Table 2 [19]. It is observed that capacity values ranged between 1361 and 1698 PCU/hr.…”

Section: Carriageway Widthmentioning

confidence: 99%

Two-Lane Highway Capacity Estimation Based on Geometric Features

Vijay

Al‐Mansour

Lee

2023

Civil and Environmental Engineering

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The majority of roads in most countries are two-lane highways. These lanes quickly reach their capacity and must be upgraded on a regular basis. To do so, we must first determine the capacity of the street. The primary objective of this study was to determine the effect of carriageway width, the radius of the horizontal curve, and gradients on Passenger Car Unit (PCU) values as well as on capacity of two-lane undivided Highways, and more importantly, to develop a multiple linear regression model to determine the capacity of the highway when all of these factors are present, which has not been previously reported. Green shield’s model was used to estimate the capacity of each element for all thirty-six sections using flow and speed data. Different models were built using regression analysis to estimate capacity independently, and the combined model was developed as a result. It has been noted that with proportionate increases in carriageway width and radius of the curve, there is an equivalent rise in PCU values and highway capacity, providing improved comfort and safety to road users. It was also discovered that when the value of the gradient increases cause increase in PCU values but the highway capacity decreases, thereby increasing the vehicle operating cost. Where all of these characteristics are present simultaneously in a section, the resulting multiple linear regression model was proven to be appropriate. It is believed to be valuable to practitioners as well as in the development or revision of Indian highway capacity manuals.

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Development of Performance Measurement Models for Two-Lane Roads under Vehicular Platooning Using Conjugate Bayesian Analysis

2023

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Vehicular platooning is one of the most challenging issues affecting the level of service (LOS) of two-lane roads. This phenomenon has been involved with variables governing performance measures. Thus, to improve the quality of these roads and predict a comprehensive model for future plans under this phenomenon, the present study aimed to evaluate the effect of vehicular platooning variables on performance measures and then identify the critical headways of vehicular platooning associated with the vehicle-gap-acceptance behavior. Multiple linear regression (MLR) and Bayesian linear regression (BLR) models were used to develop performance measurement models that are based on conjugate Bayesian analysis. The vehicular platooning was formed in the threshold of a time headway of 2.4 s. According to a comparative evaluation of the developed models, the best predictive model was found between the traffic flow and the number of followers per capacity (NFPC). In addition, the BLR model showed a higher accuracy rate in predicting NFPC compared with the MLR model due to low errors and high prediction performance. Thus, NFPC was introduced as a surrogate performance measure, which had a premier capability to predict the LOS for unsaturated and saturated traffic conditions compared with the two performance measures from the Highway Capacity Manual (2010), including percent time spent following and average travel speed.

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Comparative Study of Methods Used for a Capacity Estimation on Two Lane Undivided National Highways

Cited by 3 publications

References 2 publications

Platoon-Based Assessment of Two-Way Two-Lane Roads Performance Measure: A Classification Method

Platoon-Based Assessment of Two-Way Two-Lane Roads Performance Measure: A Classification Method

Two-Lane Highway Capacity Estimation Based on Geometric Features

Development of Performance Measurement Models for Two-Lane Roads under Vehicular Platooning Using Conjugate Bayesian Analysis

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