Determination of Applicable Adjacent Horizontal Curve Radii Using Operating Speed

Cvitanić, Dražen; Maljković, Biljana

doi:10.7307/ptt.v31i4.3088

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…A sharp horizontal curve leads to the maximum difference in operating speed if the AT speed is high. Radii of horizontal alignment less than 100 m have a significant influence on speed [47]. Furthermore, the driving workload is primarily generated during the maneuver stage, and a radius of horizontal alignment of less than 500 m imposes an additional driving workload, which adversely affects the driver's performance [48].…”

Section: Effect Of Curve Radius On Speed Behaviormentioning

confidence: 99%

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Speed Behavior of Heterogeneous Traffic on Two-Lane Rural Roads in Malaysia

Faiz¹,

Mashros²,

Hassan³

2022

Sustainability

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Highway geometry is a significant factor that affects the efficiency and safety of highway systems. The present study aims to investigate the speed behavior of various vehicle classes on the horizontal alignment of two-lane rural roads. An automatic data collection system based on a pressure sensor was employed to collect the speed of each individual vehicle, vehicle type, and headway at seven sites in each travel direction. The 85th percentile speed under free-flow conditions was used to observe the relationship between the operating speeds of various vehicle classes at consecutive curve points and the effect of the travel direction, time of day, and curve radius on the operating speed of the vehicle. A one-way ANOVA was employed to evaluate whether there is a significant difference in speed on horizontal curves. Then, a Tukey post hoc test was used to assess the significance of the difference in speed across four classes of vehicles. The results revealed that the horizontal curve affects the operating speed for all vehicle classes. A curve radius of less than 500 m, the travel direction, and the time of day are significant variables that affect the speed of all vehicle classes. The findings from this study can provide insight to transportation engineers for safer road design of horizontal curves and to assess traffic safety based on actual speed behavior.

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Section: Effect Of Curve Radius On Speed Behaviormentioning

confidence: 99%

“…The results of the study also confirm that a radius ≤500 m significantly affects vehicle speed. Several researchers have found that a sharp horizontal alignment is a significant contributor to differences in speed between tangent and curve sections [33,47].…”

Section: Effect Of Curve Radius On Speed Behaviormentioning

confidence: 99%

Speed Behavior of Heterogeneous Traffic on Two-Lane Rural Roads in Malaysia

Faiz¹,

Mashros²,

Hassan³

2022

Sustainability

View full text Add to dashboard Cite

show abstract

Reviews and prospects of human factors research on curve driving

Han,

Du,

Zheng

et al. 2023

Journal of Traffic and Transportation Engineering (English Edit

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Evaluation on Lateral Stability of Vehicle: Impacts of Pavement Rutting, Road Alignment, and Adverse Weather

et al. 2023

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The combination of pavement rutting, poor road alignment, and extreme adverse weather will seriously threaten the driving safety of vehicles, whereas only a few of these factors are commonly concerned. This study aims to efficiently evaluate the impacts of various driving conditions on the lateral stability of the vehicle and produce a practical recommendation for pavement maintenance in what concerns rutting. A systematic framework was, thus, developed to conduct a comprehensive evaluation of the lateral stability of the vehicle, which incorporates a single-factor test and multi-factor test based on the stability indicators obtained from Carsim simulations. The vehicle road weather model was established in the Carsim software by considering seven factors, including driving speed, width–height ratio (WHR) of rutting sidewall, radius of circular curve, superelevation, crosswind angle, crosswind speed, and friction coefficient, respectively. The results show that the established framework behaves with satisfactory performance, regarding evaluating the effect of various impact factors on the lateral stability of the vehicle while driving across rutting. Stability indicators suddenly fluctuate in a short time, due to the instantaneous wandering behavior of crossing rutting. Additionally, the sudden fluctuation phenomenon is greatly enlarged, and the vehicle is inclined to occur with lateral instability when WHR equals 5, particularly in roll-over instability. It is recommended to concurrently confine the WHR greater than 10 and friction coefficient greater than 0.4, in order to ensuring driving stability. The multi-factor test revealed that the vehicle speed and WHR of the rutting are leading factors that affect driving stability, followed by the radius of circular curve, superelevation, crosswind angle, crosswind speed and friction coefficient, respectively, which are both essential factors for driving stability. The outcomes of this study may contribute to supplying guidelines for controlling key adverse conditions and making decisions on pavement maintenance.

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Determination of Applicable Adjacent Horizontal Curve Radii Using Operating Speed

Cited by 3 publications

References 6 publications

Speed Behavior of Heterogeneous Traffic on Two-Lane Rural Roads in Malaysia

Speed Behavior of Heterogeneous Traffic on Two-Lane Rural Roads in Malaysia

Reviews and prospects of human factors research on curve driving

Evaluation on Lateral Stability of Vehicle: Impacts of Pavement Rutting, Road Alignment, and Adverse Weather

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