Annotation. This thesis presents some analysis of car braking process: a number of analythical formulas and graphic illustrations, discussion on different modes of braking, wider analysis of the main factors, having influence on the braking process. The main parameters and characteristic features, such as steady deceleration, driver’s reaction time, time of deceleration increase, restopping time and others, are also examined, values of most of them were specified during experimental research. A number of dependency graphs and numerical data, recommended for use in calculations performed during the examination of road accidents (and so improving the accuracy of the methods) was also presented.

Šiame darbe yra analizuojama kelių eismo saugumo situacija ir avaringumo veiksniai remiantis statistika ir užsienio šalių mokslininkų tyrimais. Tiriamajame darbe taip pat pateikiami taikomos avaringumo nustatymo metodikos trūkumai ir pasiūlymai. Darbe yra keletas tyrimo objektų. Atliktas vizualinis Vilniaus miesto eismo reguliavimo ir organizavimo sistemos tyrimas nustatant pagrindines problemas ir „juodųjų dėmių“ analizė nustatant pagrindinius didesnio avaringumo faktorius. Siekiant nustatyti kelio nuolydžio įtaką eismo saugumui buvo atliktas stabdymo automobiliu tyrimas įvertinant lėtėjimo pagreičio kitimą priklausomai nuo vertikalių kelio nelygumų. Darbą sudaro įvadas ir 5 aiškinamojo rašto skyriai, pabaigoje pateikiamos išvados ir pasiūlymai. / This research analyses the situation of road traffic safety and factors in traffic accidents based on statistic and studies of foreign scientists. Research also represents weaknesses of actual accident methodology and proposals. There are few objects of investigation. Visual research is made by assessing the main problems of traffic regulation and organization system in Vilnius city and “black spots” analysis identifying factors of increased accident rate. Car braking investigation was performed by pursuing to estimate the alternation of deceleration in roads with vertical gradient influence to traffic safety. Research consists of introduction, 5 descriptive parts, summarized giving conclusions and proposals.

The suspension of the motor vehicle is one of the most important elements of the flexible mounted and inflexible mounted masses of the vehicle bodywork, and most attention is paid to its exploration and improvement. Analysis of models of equivalent oscillation systems of motor vehicles testifies that the evaluation of motor vehicle oscillations and modelling of its motion modes is still very topical and requires further research. Suspension models of motor vehicles offered in publications regard only the influence of road irregularities, and the modernisation of these models is directed towards the improvement of passengers’ comfort. However not much research has been done on the influence of oscillations of flexible mounted and inflexible mounted masses of the bodyworks of vehicles in the process of braking; also there is not much investigation of the post-accident identification of the vehicle’s movement mode corresponding to the deformations of the suspension and the longitudinal pitch of the bodywork. Research of oscillations in the conditions of emergency braking is primarily important for the work in two practical directions: 1) improvement of calculation methods of motor vehicle’s response to external impact in the conditions of real operation; 2) further improvement of research methods on the road, and analysis of fait accompli road accidents related to oscillations in the emergency braking. Methodology defining the oscillations occurring in the braking may be applied... [to full text]

The suspension of the motor vehicle is one of the most important elements of the flexible mounted and inflexible mounted masses of the vehicle bodywork, and most attention is paid to its exploration and improvement. Analysis of models of equivalent oscillation systems of motor vehicles testifies that the evaluation of motor vehicle oscillations and modelling of its motion modes is still very topical and requires further research. Suspension models of motor vehicles offered in publications regard only the influence of road irregularities, and the modernisation of these models is directed towards the improvement of passengers’ comfort. However not much research has been done on the influence of oscillations of flexible mounted and inflexible mounted masses of the bodyworks of vehicles in the process of braking; also there is not much investigation of the post-accident identification of the vehicle’s movement mode corresponding to the deformations of the suspension and the longitudinal pitch of the bodywork. Research of oscillations in the conditions of emergency braking is primarily important for the work in two practical directions: 1) improvement of calculation methods of motor vehicle’s response to external impact in the conditions of real operation; 2) further improvement of research methods on the road, and analysis of fait accompli road accidents related to oscillations in the emergency braking. Methodology defining the oscillations occurring in the braking may be applied... [to full text]