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Geometric factors influencing entry capacity of roundabouts under heterogeneous traffic conditions

Zacharia Arun Baby, Madhavan Harikrishna, Anjaneyulu M. V. L. R.

Archives of Transport

2019

Vol. 49, iss. 1

87--101

Roundabout entry capacity is influenced by geometric features of the roundabout, traffic flow characteristics, vehicle are checked. In comparison with the existing empirical models such as the LR942 regression model and German empirical model, the proposed regression model produced better estimates and much lower RMSE values. Approach width is found to have the highest impact on entry capacity. The entry capacity is found to be negatively influenced by entry angle. Circulating flow is considered in terms of per metre width against the usual convention. This modification incorporates the effect of circulatory roadway width also into consideration. The circulatory roadway width has a diverse effect on entry capacity at different levels of circulating flow. Modification of inscribed circle diameter and circulatory roadway width is suggested as a potential solution for improving entry capacity. Sensitivity analysis is carried out to quantify the effect of variation of entry angle, circulatory roadway width, inscribed circle diameter and approach width on entry capacity based on the non-linear model. The sensitivity plots can be used to make subtle geometric modifications to improve capacity at congested roundabouts.

Metody szacowania strat czasu pojazdów ponoszonych na małych rondach

Macioszek E.

Zeszyty Naukowe. Transport / Politechnika Śląska

2006

z. 63

173-180

W artykule przedstawiono opis kilku różnych metod używanych do obliczeń strat czasu ponoszonych przez pojazdy podczas przejazdu przez skrzyżowanie typu rondo. Są to metody proponowane i stosowane w Wielkiej Brytanii, Australii i w Polsce. Generalnie rozróżnia się dwa rodzaje strat czasu, jakie ponoszą pojazdy podczas przejazdu przez rondo: straty powstałe w wyniku oczekiwania w kolejce oraz straty czasu wynikające z geometrii ronda.

The reviews of delay formulas has been presented in this article. Delays at roundabouts consist of queuing delay and geometric delay. Queuing delay is the delay of vehicles waiting in queue. Geometric delay is the delay caused by the existence of the roundabouts. The summary of the UK delay formula is based on the article by Marie C. Semmens in 1985. The Australian delay formula is summarized from articles by Avent and Taylor and R. J. Troutbeck.