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The article demonstrates selected issues related to assessment of computational accuracy in accident analysis. The hereto presented theoretical grounds of the methods make it possible to consider uncertainties in the assessment of input data values. The methods were compared on the basis of their exemplary application in the case of braking process study of a vehicle in rectilinear motion. Also for the aforementioned case, the results obtained by means of various computational methods of vehicle motion (analytical and simulation models) were compared with the outcome of the experimental study.

This paper continues a subject-matter of simulation studies of a car motion with inclusion of freeplay and dry friction, but in comparison to our SAE paper 2002-01-0619 (concerning to mechanical 2WS steering systems) in this paper also power assisted 2WS as well as 4WS steering systems are also the subjects of studies. The paper presents mathematical models and simulation studies of a car handling with regard to freeplay and friction in steering system. The models are customizable for several structures of steering system. Descriptions of freeplay and friction non-linearities base on special piecewise-linear projections. Elaborated models are used for digital simulation and sensitivity analyses concerning typical open road tests of passenger car. The paper describes these investigations and presents exemplary results. They show complexity of stick-slip phenomenon and car dynamics sensitivity on the freeplay and friction in the 2WS and 4WS structures.

This paper is concerned with the simulating and optimising research of light optical systems of car lighting projectors. In the paper an attempt was made to use all accessible information about relationships between elements in a vehicle reflector system, an engineer can choose and change (manipulate) using computer aided design systems and often he has no possibility to use it. Computer science achievements and neural networks were used to optimize automobile lighting of the road in front of a moving vehicle.