Computer-aided analysis and evaluation on ramp spacing along urban expressways

Chen, Shaokuan; Mao, Baohua; Liu, Shuang; Sun, Quanxin; Wei, Wei; Zhan, Lin-xia

doi:10.1016/j.trc.2013.09.011

Cited by 12 publications

(6 citation statements)

References 47 publications

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“…Through theoretical derivation and simulation, Liu proposed the spacing between tunnel exits and interchange exits according to varying traffic volumes and diverging rates and comprehensively evaluated the traffic efficiency and pollutant emissions of different schemes based on entropy [32]. Based on a data envelopment analysis combined with a hierarchical analysis, the optimal spacing is proposed for the four ramp combination types of exit and entrance [33]. A scholar has comprehensively considered multiple aspects, such as safety, accessibility, and cost, and developed a dual-objective optimization model for optimizing the layout of highway interchanges [34].…”

Section: Small Spacing Interchange Improvement Methodsmentioning

confidence: 99%

Research on Efficient Operation for Compound Interchange in China from an Auxiliary Lanes Configuration Aspect

Tian,

Shi,

Yang

et al. 2023

Applied Sciences

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Interchanges are the key nodes of the freeway. Due to the existence of weaving behavior, the traffic flow situation is more complicated for small spacing interchanges. Continuous auxiliary lanes are usually used to connect the entrance and exit to form a compound interchange to reduce the interference of weaving behavior. However, when it comes to the design of auxiliary lane forms, China lacks relevant design specifications and research in this area. As a result, there often exists the phenomenon of mismatch between the design form and the traffic volume. In this paper, we took a compound interchange in Xi’an as the research object, proposing four auxiliary lane design schemes and using VISSIM (2022 student) software to establish the simulation model. Additionally, various traffic conditions were simulated through sensitivity analysis. Finally, using the factor analysis method and entropy method, we comprehensively assigned weights to the indexes. By obtaining the weighted scores for various schemes, it became possible to determine the applicability of each scheme under different traffic conditions. The results indicate that the gradient auxiliary lane can be applied to most traffic conditions and has a smaller land occupation than the traditional design, which is an optimization and improvement for the traditional design form.

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Section: Small Spacing Interchange Improvement Methodsmentioning

confidence: 99%

Research on Efficient Operation for Compound Interchange in China from an Auxiliary Lanes Configuration Aspect

Tian,

Shi,

Yang

et al. 2023

Applied Sciences

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“…In this study, the Grubbs outlier test was used to detect the outliers based on the spot speed, as Equation (1). The outliners were removed from the trace data to eliminate the error and improve the accuracy.…”

Section: Statistical Analysis Of Traffic Flowmentioning

confidence: 99%

“…The expressway is an important component of the urban transportation system in China's major developed cities. The urban expressways have distinct features, such as short spacing between entrance or exit ramps, complex connections with frontage roads [1], and short deceleration lanes, which increase the probability of accidents. The off-ramps of urban expressways suffer from more crashes than other segments due to frequent, lane-changing behaviors.…”

Section: Introductionmentioning

confidence: 99%

“…Many factors play a role in the safety of off-ramps, including annual average daily traffic (AADT), ramp configurations, ramp lengths, deceleration lanes, acceleration lanes [4], and the number of lanes [1].…”

Section: Introductionmentioning

confidence: 99%

“…The contributions of this research are as follows: (1) to explore the TTCs distributions with GMM at off-ramps; (2) to determine the critical values for the crash risk severity; (3) the naive Bayesian model is developed to explore the relationship between the severity of the TTC and explanatory variables. An ordinal logistic regression model is designed for comparison at the same time.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crash Risk Assessment of Off-Ramps, Based on the Gaussian Mixture Model Using Video Trajectories

Hao

Cui

et al. 2020

Sustainability

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The focus of this paper is the crash risk assessment of off-ramps in Xi’an. The time-to-collision (TTC) is used for the measurement and cross-comparison of the crash risk of each location. Five sites from the urban expressway in Xi’an were selected to explore the TTC distribution. An unmanned aerial vehicle and a camera were used to collect traffic flow data for 20 min at each site. The parameters, including speed, deceleration rate, truck percentage, traffic volume, and vehicle trajectories, were extracted from video images. The TTCs were calculated for each vehicle. The Gaussian mixture model (GMM) was proposed to predict the TTC probability density functions (PDFs) and cumulative density functions (CDFs) for five sites. The Kolmogorov–Smirnov (K-S) test indicated that the samples followed the estimated GMM distribution. The relationship between the crash risk level and influencing factors was studied by an ordinal logistic regression model and a naive Bayesian model. The results showed that the naive Bayesian model had an accuracy of 86.71%, while the ordinal logistic regression model had an accuracy of 84.81%. The naive Bayesian model outperformed the ordinal logistic regression model, and it could be applied to the real-time collision warning system.

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Towards better road safety management: Lessons learned from inter-national benchmarking

Shen

Hermans

Bao

et al. 2020

Accident Analysis & Prevention

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Computer-aided analysis and evaluation on ramp spacing along urban expressways

Cited by 12 publications

References 47 publications

Research on Efficient Operation for Compound Interchange in China from an Auxiliary Lanes Configuration Aspect

Research on Efficient Operation for Compound Interchange in China from an Auxiliary Lanes Configuration Aspect

Crash Risk Assessment of Off-Ramps, Based on the Gaussian Mixture Model Using Video Trajectories

Towards better road safety management: Lessons learned from inter-national benchmarking

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