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Modelling vehicular behaviour using trajectory data under non-lane based heterogeneous traffic conditions

Gaddam Hari Krishna, Rao Ramachandra K.

Archives of Transport

2019

Vol. 52, iss. 4

95--108

The present study aims to understand the interaction between different vehicle classes using various vehicle attributes and thereby obtain useful parameters for modelling traffic flow under non-lane based heterogeneous traffic conditions. To achieve this, a separate coordinate system has been developed to extract relevant data from vehicle trajectories. Statistical analysis results show that bi-modal and multi-modal distributions are accurate in representing vehicle lateral placement behaviour. These distributions help in improving the accuracy of microscopic simulation models in predicting vehicle lateral placement on carriageway. Vehicles off-centeredness behaviour with their leaders have significant impact on safe longitudinal headways which results in increasing vehicular density and capacity of roadway. Another interesting finding is that frictional clearance distance between vehicles influence their passing speed. Analysis revealed that the passing speeds of the fast moving vehicles such as cars are greatly affected by the presence of slow moving vehicles. However, slow moving vehicles does not reduce their speeds in the presence of fast moving vehicles. It is also found that gap sizes accepted by different vehicle classes are distributed according to Weibull, lognormal and 3 parameter log logistic distributions. Based on empirical observations, the study proposed a modified lateral separation distance factor and frictional resistance factor to model the non-lane heterogeneous traffic flow at macro level. It is anticipated that the outcomes of this study would help in developing a new methodology for modelling non-lane based heterogeneous traffic.

Odległość boczna manewru wyprzedzania statków morskich na akwenach ograniczonych

Lizakowski P.

Logistyka

2011

nr 4

Bezpieczeństwo manewrów wyprzedzania statków morskich jest istotnym elementem podczas realizacji nawigacji na akwenach ograniczonych. Specyfika akwenu ograniczonego redukuje dostępną przestrzeń manewrową. Jednym z elementów decydującym o bezkolizyjnym wykonaniu manewru wyprzedzania jest prawidłowa ocena odległości bocznej pomiędzy statkami w trakcie wykonywania tego manewru. W artykule przedstawiono przyczyny kolizji statków podczas wyprzedzania na akwenach ograniczonych.

Safety of overtaking maneuvers is an essential point of navigation carried out in restricted areas. The specificity of such areas causes reduce of maneuvering available space. One of the elements determining no collision overtaking maneuver is the correct evaluation of the lateral distance between two ships during the action. The paper presents the causes of vessel collision during overtaking in restricted areas.