Modeling Speed and Comfort Threshold on Horizontal Curves of Rural Two-Lane Highways Using Naturalistic Driving Data

Dhahir, Bashar; Hassan, Yasser

doi:10.1061/jtepbs.0000246

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…In this study, higher values were obtained: 3.5 m/s 2 (40-50 km/h), and 7.5 m/s 2 (50-80 km/h). Maybe this happened because the AASHTO policy used outdated results [3].…”

Section: Figurementioning

confidence: 99%

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Passengers’ comfort in horizontal curves on mountain roads: a field study using lateral accelerations

García-Ramírez

Aguilar-Cárdenas

2020

redin

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The comfort of passengers is one of the most significant advances in modern passenger transport. Despite its subjectivity, it could be related to the lateral accelerations on horizontal curves. This study aimed to analyze the relationship between passengers' comfort and lateral acceleration in two-lane rural mountain roads. Real-vehicle experiments were performed with 58 passengers on one road in the Ecuadorian Andes. They explored the influence of age, sex, level of stress, level of physical pain, speed, and lateral acceleration on passenger comfort. Two instruments were employed to collect data: a survey conducted to the passengers and a precise GPS device. In the survey, the passengers selected their comfort or discomfort within the curve. The GPS collected the vehicle speed, lateral accelerations and, its trajectory. As a result, it calibrated two models using Structural Equation Modeling (SEM) with the factors: comfort values, stress level and lateral acceleration. Besides, it calibrated six models using linear regression with several thresholds of speed. Differences were found between right and left curves, which had not been detected by previous researchers. The research suggests thresholds of lateral acceleration in mountain roads in a Latin American country that would improve their design for better performance and safety.

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“…In this study, higher values were obtained: 3.5 m/s 2 (40-50 km/h), and 7.5 m/s 2 (50-80 km/h). Maybe this happened because the AASHTO policy used outdated results [3].…”

Section: Figurementioning

confidence: 99%

“…The lateral acceleration of a vehicle, one of the most influential factors in road design [1] and road safety [2,3], is influenced by three main factors: curvature, vehicle model and type of road [4]. First, when a vehicle moves in a curved path, it experiments a centripetal force that acts toward the center of curvature.…”

Section: Introductionmentioning

confidence: 99%

Passengers’ comfort in horizontal curves on mountain roads: a field study using lateral accelerations

García-Ramírez

Aguilar-Cárdenas

2020

redin

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“…As shown in Figure 4. Figure 4 shows that the lateral force generated by a vehicle operating on a horizontal curve Y is given by Equations (1) [22] and (2) [23].…”

Section: Vehicle Horizontal Stress Analysis When Operatingmentioning

confidence: 99%

Horizontal Alignment Security Design Theory and Application of Superhighways

Pei

Ran

et al. 2020

Sustainability

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In China, the maximum design speed of highways is 120 km/h, which first appeared in the Highway Engineering Technical Standard (Trial) in 1951. However, vehicle performance, road design, and construction technology have been greatly improved over the past 68 years. To adapt to the development demands of highway design speeds above 120 km/h in the future, it is urgent to study superhighway alignment design theory. Therefore, the horizontal alignment security design theory of superhighways was developed in this paper. First, the definition, classification, and construction mode of a superhighway and suitable vehicles of different grades are presented. Then, the lengths of straight lines were limited to reduce driving fatigue. Next, the minimum radii of circular curves were calculated based on driver characteristics and stress analysis of operating vehicles. Finally, the minimum lengths of transition curves were calculated based on the centrifugal acceleration of the operating vehicles, the travel time, and the passenger visual characteristics. The calculation and analysis results show that the superhighway linear features conform to the vehicle operating characteristics, and can ensure the safety of driving.

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“…Most of the driver behavior models in the literature were developed considering vehicles traveling at free-flow speed (FFS) that have a headway ( h ) ⩾ 5 s ( 20 ). However, in this paper vehicles were considered at FFS conditions when the h ⩾ 3 s based on the analysis conducted by Dhahir and Hassan ( 21 , 22 ). The models presented in this section were checked for multicollinearity, and were found not to suffer multicollinearity problems with the highest variation inflation factor (VIF) for all models equal to 3.532.…”

Section: Models Developmentmentioning

confidence: 99%

“…Considering the vehicle speed state along the vehicle path, a methodology was developed by the authors to evaluate the comfort threshold for each trip by searching for the minimum value of average lateral acceleration within a sliding window while the trip is at a constant speed state ( 21 ). Regression analysis of the collected data yielded Equations 1 and 2 as the best regression models for the comfort threshold for drivers on horizontal curves in terms of the adjusted coefficient of determination ( R adj 2 ) ( 22 ). Both models are panel models (PM) that account for the independent variable’s mean and standard deviation, and thus can predict the variable’s distribution:…”

Section: Models Developmentmentioning

confidence: 99%

Framework for Reliability-Based, Safety-Explicit Horizontal Curve Design using Naturalistic Driving Data

Dhahir

Hassan

2019

Transportation Research Record: Journal of the Transportation R

Self Cite

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The design of horizontal curves is generally based on a deterministic analysis of driver comfort using a point-mass model based on data mostly from the early 1900s and might be outdated. Furthermore, the design lacks quantitative safety evaluation. This paper proposes a new framework for horizontal curve design that provides a quantitative evaluation of safety performance. The framework uses recently collected data from the naturalistic driving study (NDS) to develop models to predict distributions of parameters that reflect contemporary driver behavior, such as speed on curve and comfort threshold in favorable weather and rainy conditions. Statistical models were also developed for more accurate evaluation of vehicle dynamic parameters than the point-mass model. The variability of driver behavior and vehicle dynamics parameters was considered using reliability analysis to develop surrogate safety measures for four design criteria: vehicle stability, comfort threshold, sight distance, and rollover. Safety performance functions were then developed to relate reliability indices to expected safety performance. The results showed that only the driver comfort criterion was not significantly related to expected safety performance. A design example was presented using the proposed framework, which showed the expected change of safety performance of the curve being considered. An optimum radius was then found to minimize the number of expected collisions.

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Modeling Speed and Comfort Threshold on Horizontal Curves of Rural Two-Lane Highways Using Naturalistic Driving Data

Cited by 18 publications

References 12 publications

Passengers’ comfort in horizontal curves on mountain roads: a field study using lateral accelerations

Passengers’ comfort in horizontal curves on mountain roads: a field study using lateral accelerations

Horizontal Alignment Security Design Theory and Application of Superhighways

Framework for Reliability-Based, Safety-Explicit Horizontal Curve Design using Naturalistic Driving Data

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