ASPECTS REGARDING THE NUMERICAL MODELLING OF PEDESTRIAN-VEHICLE ACCIDENTS WHEN BOTH PARTIES HAVE CONTINUOUS VISIBILITY OF EACH OTHER IN TRAFFIC

Adrian TODORUŢ, Nicolae CORDOŞ, István BARABÁS, Monica BĂLCĂU

Abstract

The paper evaluates from a physical and mathematical perspective the kinematic values of a traffic incident with continuous reciprocal visibility between a pedestrian and a vehicle in various stages of this incident. When evaluating the kinematic values that characterise such an incident one takes into account the parameters resulted from the initial research of the incident site, namely the testimonial evidence. By reconstructing the pedestrian traffic incidents one aims to determine: the vehicle’s speed in various moments of the incident (the moment the incident danger occurred – the moment in which the pedestrian started to cross the road; the moment the braking marks are imprinted; the moment of the impact with the pedestrian); the distance between the vehicle and the pedestrian when the danger occurred; the length made by the pedestrian and the vehicle respectively from the moment the pedestrian stepped on the road and until they got hit by the vehicle; the time lapsed between the moment when the danger was noticed and the moment the pedestrian got hit; the time lapse for the driver’s perception-reaction and the length made by the vehicle during this time; the analysis of all the possible variants for the incident to have been avoided.
The results obtained are in a graphic form and they provide the opportunity to observe various stages of the incident. The numerical model developed like this can be applied to solve a large number of traffic incidents of this type – pedestrian-vehicle – in order to establish the dynamics of such incidents and at the same time to establish the human factor involved in them.
The computerised analysis has several advantages – the reduction of the calculation time, the possibility to simulate various incident situations, etc. – and it becomes a useful and needed instrument for technical experts and engineers who reconstruct traffic incidents and develop safety systems on vehicles.
Key words: vehicle, pedestrian, traffic incident, reciprocal visibility, human factor, numerical modelling.

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