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Examination of the vehicle light intensity in terms of road traffic safety: a case study

Vrábel J., Rievaj V., Synák F., Babic D.

Archiwum Motoryzacji

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2018

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Vol. 81, nr 3

119--128

EN

Road transport is an essential part of modern life. It brings with itself, besides the desired effects, negative aspects as well. Negative aspect is not only the emissions production but also the traffic accidents occurrence even with tragic consequences. In proportion to traffic intensity, accidents during decreased visibility represent a significant share. A driver has a limited source of information at this time, since only vehicle headlights illuminate the runway and its surroundings. However, these do not only illuminate the roadway ahead of the vehicle, but part of the emitted light also falls into the drivers’ eyes of vehicles in the opposite direction. Thus, the eyes of such glared drivers worse recognize details, or lose the ability to see at all, i.e. vision ability. The level of vision loss depends on the light intensity that falls into the drivers’ eyes in the opposite direction. This light intensity is related not only to the correct headlights alignment (setting) but also to their design. In this paper, three generations of headlights in terms of the light intensity falling into the driver’s eyes of the vehicle in the opposite direction are compared. The headlights alignment of the examined vehicles was checked prior to measurements in accordance with the manufacturer's requirements. Given the fact that intensity of the emitted light is also related to the age of the used source, they have been replaced by the new ones. For the reason of objectivity, examination was performed at night at the New Moon phase, thus it did not light up. The starlight also did not affect the measurement results because it was cloudy, but it did not rain. There were no artificial sources of light near the measuring point.

2

Does electric car produce emissions?

Rievaj V., Synák F.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2017

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z. 94

187--197

EN

This article focuses on the comparison of the amount of emissions produced by vehicles with a combustion engine and electric cars. The comparison, which is based on the LCA factor results, indicates that an electric car produces more emissions than a vehicle with combustion engine. The implementation of electric cars will lead to an increase in the production of greenhouse gases.

3

Legislation and road safety

Majerová Z., Rievaj V.

Archives of Transport System Telematics

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2013

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Vol. 6, iss. 1

37--40

EN

Traffic accident statistics point out that the most dangerous fault of drivers is the fact of not adapting the speed of their vehicles. Many of them often do not realize the fact that it is necessary to comply with the allowed speed not only for their own travel safety but also because of other road users ability to respond to them. In this case the driving speed is an essential assumption to handle a situation not only in a populated urban area but also on the open road. The quality and condition of the road surface has a signifi cant impact on the driving safety. Drivers are oft en unaware of the fact that with increasing speed also their kinetic energy increases, which is converted into braking heat then and the braking distance of their vehicles gets longer. The text provides some model situations of these effects.

4

Fuel consumption and driving resistances

Rievaj V., Kalasova A., Rievaj J.

Archives of Transport System Telematics

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2012

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Vol. 5, iss. 2

32-36

EN

The climate of our planet is changing, which, scientists believe, is caused by the production of greenhouse gases (GHG). To stabilize the concentrations of those gases in the atmosphere, it is necessary to decrease their production. Since transport is one of the major sources of GHG emissions, the most obvious solution is to decrease fuel consumption by vehicles. The amount of fuel used by a vehicle depends directly on the force of driving resistance, including rolling resistance and air resistance. The aim of the article is to indicate one of the easiest possibilities of decreasing these resistances. A small change in the shape of a vehicle’s frontal area leads to a significant reduction in air resistance.

5

Warunki techniczne pojazdu a emisja spalin

Liščák S., Rievaj V., Šulgan M.

Eksploatacja i Niezawodność

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2008

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nr 1

61-63

PL

Artykuł prezentuje wyniki badań mających na celu znalezienie różnic w emisji spalin dwóch silników o zapłonie iskrowym pojazdów osobowych o różnym roku produkcji. Porównania dokonano podczas poziomego ruchu pojazdów ze stałą prędkością. Podczas prowadzonych badań silnik samochodu pokonywał tylko następujące opory: układu napędowego, toczenia oraz powietrza. Do badań wybrano samochody o porównywalnych masach i powierzchni czołowej. Były to Škoda 105 L wyprodukowana w 1983 roku oraz Toyota Yaris 1,0 VVTi z roku 2003.

EN

The article presents the research results aimed to get true differences of pollution production between two cars with spark ignition engine depending on the car's age. A car movement by constant speed on horizontal plane was realised for comparison. The vehicle engine must overcome only mechanical transmission losses, air resistance and rolling resistance, too. The air resistance size depends on the speed, the vehicle frontal area and the air resistance coefficient. It was chosen vehicles with approximated equal weight and approximated equal vehicle frontal area for comparison. These conditions fulfil vehicles Škoda 105 L, made in 1983, and Toyota Yaris 10,0 VVTi, made in 2003

6

Logistyka w warunkach śródlądowego portu rzecznego

Sosedova J., Rievaj V., David A.

Logistyka

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2005

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Nr 3

23-24

7

Centra multimodalne na Słowacji

Sulgan M., Sosedova J., Rievaj V.

Logistyka

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2005

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Nr 4

56--57