Spacing and geometric design indexes of auxiliary lanes on two-lane highway in China

Cheng, Gaofeng; Zhang, Sulu; Wu, Lixin; Qin, Lihui

doi:10.1177/1687814017723294

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Similarly, lane position and speed have varying degrees of influence on the lateral oscillation on straight sections of freeways [28]. It has been shown that the lane width is composed of lateral oscillation, vehicle width, and outside clearance [33]. However, Cheng's study only used 70 questionnaires to determine the lateral offset at different speeds, which may lack powerful data support.…”

Section: Discussionmentioning

confidence: 99%

Lateral Oscillation Characteristics of Vehicle Trajectories on the Straight Sections of Freeways

et al. 2022

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The lateral oscillations of vehicle trajectories are a significant cause of collisions. There is a dearth of research, however, on the oscillatory behaviors of vehicles driving on straight sections of freeways. This study aimed to investigate the effects of vehicle type, lane position, and speed on oscillation behavior and to propose quantitative indicators to explain lateral oscillation characteristics. Based on these characteristics, a more appropriate lane width can be determined. First, the k-means algorithm was performed to cluster the vehicles into three categories: passenger cars, medium-large cars, and extra-large trucks. Then, statistical methods such as analysis of variance (ANOVA) and regression analysis were employed to elaborate on the speed distribution, lateral amplitude (LA), and distance traveled within the oscillation cycle (DTOC) for various vehicle types. The results show that different types of vehicles have different lateral oscillation tendencies. The LA and DTOC for passenger cars are generally more extensive than for medium-large cars and extra-large trucks, and their oscillation patterns are the most complicated. The vehicle trajectory oscillation pattern varies significantly for different lane positions and speeds, but speed is the dominant influencing factor. The naturalistic driving dataset from German freeways served as the foundation for this study. These results can assist road engineers in better understanding the behavioral characteristics of vehicle trajectory oscillations and designing safer freeways.

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Section: Discussionmentioning

confidence: 99%

Lateral Oscillation Characteristics of Vehicle Trajectories on the Straight Sections of Freeways

et al. 2022

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“…satisfying the similarity conditions specified by the third theorem as much as possible, the main factors that play a role should be grasped, minor factors should be omitted, and the primary similarity conditions should be maintained to obtain an approximate similarity that is sufficiently accurate in practice. The main mechanical parameters of the model following the above similarity relationship are set as follows [21][22][23][24]:…”

Section: Selection Of Similar Materials For the Model 421 Model Test ...mentioning

confidence: 99%

“…imate similarity that is sufficiently accurate in practice. The main mechanical parameters of the model following the above similarity relationship are set as follows [21][22][23][24]:…”

Section: Selection and Preparation Of Materials For Surrounding Rock ...mentioning

confidence: 99%

Research on the Experimental System of Reinforcing the Base of Shallow Buried and Wet Collapsible Loess Tunnels

Zhao

et al. 2023

Buildings

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Due to the complexity of the surrounding rock structure and the geological environment of tunnel excavations, traditional analytical methods are insufficient in effectively dealing with the complex nonlinear deformation problems arising from tunnel excavation. In contrast, geomechanical model tests can comprehensively simulate the excavation construction process of tunnels and the mode and time effects of loads, providing a more realistic reflection of the complete process of engineering stress and deformation. Therefore, this study conducted a model test on reinforcing the loess tunnel base, building upon the first tunnel of the Lanqing Expressway located on the north bank of the Yellow River in Lanzhou City. The study utilized similarity theory to explore the theoretical design of the model and established a specialized model test platform to design the experiments with the goal of obtaining more scientific and effective experimental schemes to ensure the safety of soil reinforcement in tunnel bases during construction. This research will contribute to improving the safety, reliability, and economy of loess tunnel base reinforcement projects, and has a certain reference value for research in this field.

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“…Kirby et al [21] prepared an evaluation process to assess the benefit-cost ratio of implementing 2 + 1 highways depending on terrain type, traffic volume (AADT), percentage of heavy vehicles, and length and spacing of passing lanes. Recently, Cheng et al [52] developed another framework to perform cost-benefit analyses of providing auxiliary passing lanes on two-lane highways based on traffic simulations and questionnaires. Benefits included the reduction of crash-related costs and saved time per kilometer, while costs included construction and maintenance.…”

Section: Median Barriersmentioning

confidence: 99%

2 + 1 Highways: Overview and Future Directions

Romana

Martin-Gasulla

Moreno

2018

Advances in Civil Engineering

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Most of the rural transportation system is composed of two-lane highways, and many of them serve as the primary means for rural access to urban areas and freeways. In some highways, traffic volumes can be not high enough to justify a four-lane highway but higher than can be served by isolated passing lanes, or can present high number of head-on collisions. In those conditions, 2 + 1 highways are potentially applicable. This type of highway is used to provide high-performance highways as intermediate solution between the common two-lane highway and the freeway. Successful experiences reported in Germany, Sweden, Finland, Poland, or Texas (US) may suggest that they are potentially applicable in other countries. The objective of this white paper is to provide an overview of the past practice in 2 + 1 highways and discuss the research directions and challenges in this field, specially focusing on, but not limited to, operational research in association with the activities of the Subcommittee on Two-Lane Highways (AHB40 2.2) of the Transportation Research Board. The significance of this paper is twofold: (1) it provides wider coverage of past 2 + 1 highways design and evaluation, and (2) it discusses future directions of this field.

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Spacing and geometric design indexes of auxiliary lanes on two-lane highway in China

Cited by 6 publications

References 8 publications

Lateral Oscillation Characteristics of Vehicle Trajectories on the Straight Sections of Freeways

Lateral Oscillation Characteristics of Vehicle Trajectories on the Straight Sections of Freeways

Research on the Experimental System of Reinforcing the Base of Shallow Buried and Wet Collapsible Loess Tunnels

2 + 1 Highways: Overview and Future Directions

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