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Road Safety Barriers and the Safety of Road users – the Analysis of the Situation in Poland

Rzepczyk Szymon, Majer Jakub, Obst Maciej

Logistics and Transport

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2022

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Vol. 55-56, No. 3-4

19--36

EN

Road safety barriers are a basic element of the road infrastructure aimed at improving the safety of road users. Design parameters and indications for assembly are strictly regulated by the GDDKiA (General Directorate for National Roads and Motorways) guidelines in accordance with the European standards. In Poland, the most commonly used barriers are thin-walled metal sheet barriers, rope barriers, and concrete ones. The types differ in terms of technical parameters and level of security they provide. One of the purposes of installing road safety barriers is to protect road users from hitting an obstacle in the vicinity of the road, and to protect people around the accident from the effects of an uncontrolled vehicle leaving the road. The effects of a collision caused by hitting a protective road barrier depend mainly on the type of the barrier and the vehicle. The authors made a detailed and interdisciplinary analysis of data on accidents resulting from hitting a road safety barrier, comparing them with information available in the literature, combining the technical aspects of the use of barriers with a medical description of the description of typical injuries.

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Analysis of the influence of the car impact velocity on the loads of the dummies in the front and rear seats

Żuchowski A.

Archiwum Motoryzacji

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2018

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Vol. 81, nr 3

141--158

PL

It was considered an influence of the velocity, at which the passenger car hits into the obstacle on the dynamic loads of the dummies in the front and back seats. For this purpose, the results of 28 crash tests published on the Internet by the National Highway Traffic Safety Administration (U.S.A.) were used. The crash tests of 14 models of the cars were conducted at two values of the impact velocity, at which the cars hits into a barrier (40 and 56 km/h, as well as 48 and 56 km/h). It was shown an influence of the impact velocity on the car deceleration and their deformation specification. It was paid attention to the loads of a driver and a passenger in the front seats (dummies representing a 5-centile men and 5-centile woman) and the passengers in the back seats (dummies representing a 5-centile woman and a 6-year-old child). During an evaluation of the dummy loads were employed the indicators of biomechanical impedance of the human body in respect of the effects of the impact loads related to the head, neck and chest. It was determined that an increase of the velocity at the moment of hitting into an obstacle from 40 km/h up to 56 km/h results in the increase in the risk of serious injury (AIS3+) of the 5-centile woman from 30÷60% to 35÷90%. Increasing the velocity at which a car hits an obstacle from 48 km/h up to 56 km/h results in the increase in the risk of severe injury of the 50-centile woman from 25÷40% to 30÷55%. It was emphasised that the effectiveness of the airbag may depend on the impact velocity, at which car hits the obstacle.

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Analysis of the influence of the impact speed on the risk of injury of the driver and front passenger of a passenger car

Żuchowski A

Eksploatacja i Niezawodność

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2016

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Vol. 18, no. 3

436--444

EN

The subject of the analysis was the influence of the speed, at which a personal car hit an obstacle, on the risk of injury of the driver and the passenger sitting in the front seat. With this goal in mind, several hundred of crash tests were analysed, published on the Internet by National Highway Traffic Safety Administration (USA). The analysis focuses on the cases involving a frontal impact of the car on a rigid barrier. For the purpose of assessing the forces acting on a dummy, Head Injury Criterion (HIC36) and Chest Acceleration (CAcc), were applied, calculated on the basis of the resulting acceleration of head and chest of the dummy. Separate analyses were performed for the forces acting on the dummy representing 50-centile man (M50) and 5-centile woman (F5). A statistical analysis of the results of the crash tests was performed in order to determine the typical values of HIC36 and CAcc factors, as well as the risk of severe injury of the driver and the passenger at a given collision speed. The risk of injury was calculated on the basis of provided in the research literature so-called injury risk curves. It was determined that increasing the speed at which a car hits an obstacle from 25 km/h up to 56 km/h results in the increase in the risk of severe injury (AIS4) of the driver and the passenger from 2 to 10%. Some functions were proposed, describing the relation between the risk of injury and the velocity of collision.

PL

Rozważono wpływ prędkości uderzenia samochodu osobowego w przeszkodę na ryzyko obrażeń kierowcy oraz pasażera na przednim fotelu. W tym celu wykorzystano wyniki kilkuset testów zderzeniowych, udostępnionych w Internecie przez National Highway Traffic Safety Administration (USA). Uwagę skupiono na czołowe uderzenie samochodu w sztywną barierę. Podczas oceny obciążeń manekinów wykorzystano wskaźniki obrażeń głowy HIC36 oraz torsu CAcc, które oblicza się na podstawie wypadkowego przyspieszenia działającego na głowę i tors manekina. Oddzielnie rozważono obciążenia manekina reprezentującego 50-centylowego mężczyznę (M50) oraz 5-centylową kobietę (F5). Przeprowadzono statystyczną ocenę wyników testów zderzeniowych, której celem było określenie dominujących wartości wskaźników HIC36 i CAcc oraz ryzyka ciężkich obrażeń kierowcy i pasażera przy danej prędkości zderzenia. Ryzyko obrażeń obliczono na podstawie dostępnych w literaturze tzw. funkcji ryzyka obrażeń. Ustalono, że zwiększenie prędkości uderzenia samochodu w przeszkodę z 25 km/h do 56 km/h zwiększa ryzyko ciężkich obrażeń (AIS4) kierowcy i pasażera z 2 do 10%. Zaproponowano funkcje wiążące ryzyko obrażeń i prędkość zderzenia.

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Ocena ryzyka obrażeń pasażerów podczas wypadku drogowego mikrobusu, jako kryterium doskonalenia konstrukcji foteli i ich rozmieszczenia

Żuchowski A., Prochowski L., Zielonka K.

Logistyka

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2014

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nr 3

7166--7174

PL

Bezpieczeństwo przewozu osób mikrobusami to rozległe zagadnienie, które wymaga wielu badań i analiz. Konieczne jest poszukiwanie rozwiązań kompromisowych pomiędzy funkcją foteli w zakresie poprawy komfortu jazdy, dążeniem do minimalizacji ryzyka obrażeń w czasie wypadku drogowego, a koniecznością transportu możliwie dużej liczby pasażerów. Celem prowadzonych rozważań jest opracowanie metody obliczeniowej, w której obecnie rozpoznawane relacje pomiędzy cechami konstrukcyjnymi foteli, ich rozmieszczeniem w mikrobusie oraz działaniem środków ochrony indywidualnej na osoby o różnych cechach antropometrycznych zostaną wykorzystane do liczbowej oceny ryzyka obrażeń pasażerów podczas wypadku drogowego. Opisywane relacje są analizowane na podstawie wyników coraz szerzej prowadzonych badań eksperymentalnych i symulacji komputerowej w tym zakresie.

EN

The safety of passenger transportation by minibuses is a complex issue, which requires extensive research and analyses. Solutions must be sought that would be a compromise between the seat functions aimed at achieving the best possible ride comfort, the striving to minimize the risk of injury in case of a road accident, and the necessity to transport as many passengers as possible. Deliberations have been presented that would lead to developing a calculation method, where the relations recognized at present between constructional features of seats, deployment of seats in a minibus, and action of individual protection means on people with different anthropometric features would be used for numerical evaluation of the risk of injuries to vehicle passengers during a road accident. The relations under consideration are analysed on the grounds of results of experimental research and computer simulations, which are more and more widely carried out on these issues.