A Methodology to Estimate Parameters of Critical Gap Distribution

Vikram, Durgesh; Agarwal, Somya

doi:10.1016/j.trpro.2020.08.067

Cited by 4 publications

(4 citation statements)

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“…Calculating CG purely based on inconsistent driver behavior is a difficult task ( 19 ). Developed countries have seen many studies based on the above discussed methods with the aim of examining their efficiency and estimation accuracy.…”

Section: Literature Reviewmentioning

confidence: 99%

Impact of Inconsistent Behavior of Drivers on Estimation of Critical Gap at Multi-Lane Roundabouts

Bhasin

Kumar

2023

Transportation Research Record: Journal of the Transportation R

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Critical gap (CG) estimation, while taking into consideration inconsistent driver behavior resulting from heterogeneous traffic conditions, is a tedious task. Several methods dealing with CG estimation have been developed in the past but limited research has been done in this regard for developing countries and there is a lot of scope to explore this field considering varying traffic conditions on the roads. In this study, the maximum likelihood method (MLM), one of the most prominent methods of determining CG, has been compared with two other methods developed for traffic conditions prevailing in India. These methods use different techniques for calculating the CG, such as minimization of absolute differences of gaps given by Ahmad et al., and minimization of square root of standard deviation of actual gap value from the predicted CG as per the Indian Highway Capacity Manual (Indo-HCM). This paper discusses the estimation of CG for five different categories of vehicles using these methods to counter the heterogeneity of traffic. Data has been collected on two urban multi-lane roundabouts in India. SOLVER in MS Excel is used to optimize the functions defined in all three methods. The results reveal that the method suggested by Ahmad et al. gives the most consistent results which are close to actual value when driver behavior is inconsistent. The other two methods are also reasonably consistent, with the method given in Indo-HCM being slightly better than MLM. Further, two-way ANOVA was applied to check the consistency of results.

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Section: Literature Reviewmentioning

confidence: 99%

Impact of Inconsistent Behavior of Drivers on Estimation of Critical Gap at Multi-Lane Roundabouts

Bhasin

Kumar

2023

Transportation Research Record: Journal of the Transportation R

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“…Для оценки значений критических интервалов применяются методы, основанные на принципиально разных математических моделях [28,29,30,31,32,33,34,35] Для оценки значений критических интервалов применяются методы, осно принципиально разных математических моделях [28,29,30,31,32,33,34,35]. В дан применен метод Сиглоха (Siegloch's method) [36], позволяющий одновременно оценить интервал и интервал следования из очереди.…”

Section: методы исследованияunclassified

“…Во всех изучаемых случаях при применении регресс отмечались высокие значения коэффициентов детерминации и критерия Фишера. Для оценки значений критических интервалов п принципиально разных математических моделях [28, 29, применен Для оценки значений критических интервалов применяются методы, осн принципиально разных математических моделях [28,29,30,31,32,33,34,35]. В д применен метод Сиглоха (Siegloch's method) [36], позволяющий одновременно оценит интервал и интервал следования из очереди.…”

Section: методы исследованияunclassified

“…Таблица 2 Характеристики выборок интенсивности движения и минимальных интервалов Δ Источник: составлено авторами. Определение доли свободной части потока φ выполняется с применением разных линейных и нелинейных функций [28,29,30,31,32,33,34,35]. Из всего их многообразия были выбраны две функции, в которых без включения дополнительных коэффициентов используются значения интенсивности движения и минимального интервала: модель, предложенная R. Luttinen [20] разные часы суток позволило получить приблизительно нормальные выборки ивностей движения, поскольку модули коэффициентов асимметрии имеют значения блица 2).…”

Section: Part IIunclassified

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Developing a method of multi-lane roundabouts capacity

Karimov,

Mikhailov

2023

Vestn. SibADI

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Introduction. In recent years a number of methodological and regulatory documents have been developed for public road roundabouts in the Russian Federation. In particular it was proposed to evaluate the quality of traffic management at roundabouts by the level of service measured by the average delay at roundabout entrances. The extension of the average delay criterion to the design of roundabouts requires the development of a methodology for estimating the capacity of traffic lanes at multi-lane roundabout entrances.The aim of the study. Is to develop a methodology for estimating the capacity of multi-lane roundabouts.The object of the study. Is the functioning of multilane roundabouts. Subject of the research. Are the regularities of influence of traffic volume on the values of characteristics of transport streams interaction in the conflict points of multilane roundabouts.Theoretical foundations of the research. The model for estimation of carrying capacity of multilane roundabouts based on the use of conflict points and function of acceptance of intervals is offered.Research Methodology. The video footage of multi-lane roundabouts in the cities of Bratsk, Vladivostok, Irkutsk, Lipetsk, Nakhodka, Orenburg, Petrozavodsk and Pskov was processed. On each lane of the circular carriageway, intervals in the flow, measured between the front bumpers of vehicles, were recorded. The accepted and rejected headways were registered, as well as the number of vehicles using accepted intervals. The determination of the values of critical headways and follow-up time was performed using the Siegloch’s method based on linear regression.Results. A model for estimating capacity at the entrance to a multi-lane roundabout was validated. The values of critical intervals, queuing intervals of each of the entrance lanes to 2-lane and 3-lane roundabouts were determined. The values of the minimum headways in the flows moving on the circular carriageway are determined, also the dependences of the influence of traffic intensity on the free share of the traffic flow are established.

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