Modeling the Relationship between Geometric Design and Weaving Section Flow Process of Conventional Roundabouts

Diah, Jezan Md; Rahman, Mohd Yusof Abdul; Adnan, Muhammad Akram; Ling, Kegang

doi:10.1061/(asce)te.1943-5436.0000290

Cited by 15 publications

(7 citation statements)

References 8 publications

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“…Little research exists from the viewpoint of the weaving section in capacity estimation for the roundabout. Diah et al [49] introduced a model to predict the weaving section flow at the weaving area of Malaysian conventional roundabout by regression models, while Diah et al [50] studied the relation between the roundabout performance, geometric design of roundabout, and weaving section flow process using Paramics software. Wang and Yang [51] proposed a method to estimate the capacity of the roundabout by modeling weaving gap acceptance at the weaving sections, but they did not calibrate their method.…”

Section: Roundabout Intersectionmentioning

confidence: 99%

A Novel Methodology for Estimating the Capacity and Level of Service for the New Mega Elliptical Roundabout Intersection

Mohamed

Tan

2020

Journal of Advanced Transportation

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Mega elliptical roundabout is a new intersection on rural multilane highways. This intersection was developed in a previous paper using simulation data, and the authors found that it is better than interchange (full cloverleaf) in most scenarios of traffic flow. Basically, there are no guidelines or procedures for designing mega elliptical roundabout in AASHTO Green Book, Federal Highway Administration guides, and Highway Capacity Manual. Thus, the purpose of this study is to analyze the traffic operation performance and propose a methodology for calculating the capacity of mega elliptical roundabout and also the level of service by gap acceptance theory. Moreover, this research studied the influence of different values of truck ratios and also different values of a major highway speed on geometric design and traffic operation performance for mega elliptical roundabout. To validate the thoroughness of the proposed methodology, VISSIM simulations were conducted. This research will assist practitioners in determining the appropriate geometric design, assessing mega elliptical roundabout intersections, and making comparisons with other alternatives.

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Section: Roundabout Intersectionmentioning

confidence: 99%

A Novel Methodology for Estimating the Capacity and Level of Service for the New Mega Elliptical Roundabout Intersection

Mohamed

Tan

2020

Journal of Advanced Transportation

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“…For instance, because car drivers generally anticipate that trucks need longer time to react to reduced speed, car drivers may feel unsafe accepting shorter gaps in front of trucks than cars in the circulating flow. Although Al-Omari et al (16) have used circulating flows and Md Diah et al (17) have used entry flows to estimate delay and level of service at roundabouts, both circulating and entry flows have not been used together to estimate the critical headway.…”

Section: Chris Lee and Moayed Naeem Khanmentioning

confidence: 99%

Prediction of Capacity for Roundabouts Based on Percentages of Trucks in Entry and Circulating Flows

Lee

Khan

2013

Transportation Research Record: Journal of the Transportation R

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The objective of this study was to estimate capacity at roundabouts by developing a method to adjust gap acceptance parameters for trucks. Because drivers' gap acceptance behavior is affected not only by trucks in the entry flow but also by trucks in the circulating flow, critical headways were separately estimated for various combinations of vehicle types in the circulating flow at 11 roundabouts in Ontario, Canada; Vermont; and Wisconsin. Because the percentage of trucks was different for different entry legs, the critical headways and follow-up times were estimated at each leg separately. Variations in gap acceptance behavior were also observed at one of the 11 roundabouts for 13 consecutive days to evaluate the statistical significance of differences in behavior between two entry legs. The results showed that a new adjusted critical headway improved the accuracy of capacity estimation and that the critical headways were significantly different between the two legs with different percentages of trucks in the entry flow. The study provided insight into how to capture the effect of trucks on roundabout capacity.

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“…Due to urban land constraints, an increasing number of interchanges have been built in China’s metropolitan areas, which greatly reduced travel time and improved traffic capacity. However, as an important part of interchanges, weaving sections have become inclined to be involved in more traffic accidents, such as rear-end and side wipe [6], which have brought about severe casualties and significant economic losses. To reduce traffic conflicts at weaving sections and prevent them from becoming accident-prone locations, why and how traffic crashes happen at weaving sections should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Risk Factors Affecting Traffic Accidents at Urban Weaving Sections: Evidence from China

Mao

Cao

Gan

et al. 2019

IJERPH

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As a critical configuration of interchanges, the weaving section is inclined to be involved in more traffic accidents, which may bring about severe casualties. To identify the factors associated with traffic accidents at the weaving section, we employed the multinomial logistic regression approach to identify the correlation between six categories of risk factors (drivers’ attributes, weather conditions, traffic characteristics, driving behavior, vehicle types and temporal-spatial distribution) and four types of traffic accidents (rear-end, side wipe, collision with fixtures and rollover) based on 768 accident samples of an observed weaving section from 2016 to 2018. The modeling results show that drivers’ gender and age, weather condition, traffic density, weaving ratio, vehicle speed, lane change behavior, private cars, season, time period, day of week and accident location are important factors affecting traffic accidents at the weaving section, but they have different contributions to the four traffic accident types. The results also show that traffic density of ≥31 vehicle/100 m has the highest risk of causing rear-end accidents, weaving ration of ≥41% has the highest possibility to bring about a side wipe incident, collision with fixtures is the most likely to happen in snowy weather, and rollover is the most likely incident to occur in rainy weather.

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Modeling the Relationship between Geometric Design and Weaving Section Flow Process of Conventional Roundabouts

Cited by 15 publications

References 8 publications

A Novel Methodology for Estimating the Capacity and Level of Service for the New Mega Elliptical Roundabout Intersection

A Novel Methodology for Estimating the Capacity and Level of Service for the New Mega Elliptical Roundabout Intersection

Prediction of Capacity for Roundabouts Based on Percentages of Trucks in Entry and Circulating Flows

Risk Factors Affecting Traffic Accidents at Urban Weaving Sections: Evidence from China

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