Low night vision is a factor contributing to the production of traffic accidents. In this work, we investigated the distance from which pedestrians can be seen by night, by a driver driving a car with a single functional headlamp. Six pedestrian clothing conditions were tested (black, blue, red, green, yellow and reflective vest). Pedestrians wearing dark clothing (black, blue) were only visible from a distance of 10 meters; the best visibility was for the pedestrian that wearing the reflective vest. The results demonstrate the importance of pedestrian clothing during night time on visibility while traveling on the public road.

This paper presents the variation of energy parameters and pollutant emissions of the diesel engine for different types of diesel-biodiesel-ethanol blends. The biofuels added in fossil fuels influence the mentioned characteristics. Ethanol is a renewable fuel, which is obtained from plant biomass, sugar and starch. The tests were performed on a 4-cylinder engine, water cooled with pure diesel (D), 10% ethanol (D90E10), 10% ethanol 10% biodiesel (D80B10E10), and 15% ethanol 10% biodiesel (D75B10E15). The comparative results of the engine operation with these fuels for the evaluation of performance and pollutant emissions were presented. Nitrogen oxides (NOx) decreased moderately for fuel blends compared to pure diesel. A slight increase in hydrocarbon (HC) and carbon monoxide (CO) emissions was observed with fuel blends due to low combustion temperature inside the engine cylinder. It can be concluded that the engine power has a small variation compared to diesel operation, and the pollutant emissions are lower when the engine runs on fuel mixtures.

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The aim of this paper was to analyze the injury level of the occupants of a vehicle in the case using the AEB system to reduce the velocity of a front-back collision by utilizing virtual simulations in PC-Crash software. This was achieved by conducting simulation at different velocities and 3 passive safety systems configurations. The velocities tested were 70, 75 and 80 km/h to observe the speed reduction of the vehicle in a collision by the AEB system. Also, the occupant was configured in 3 types of scenarios, when the occupant does not have the seatbelt or airbag, when only the seatbelt is used and when both seatbelt and airbag are activated. The results revealed a great speed reduction by the AEB system, reducing the impact velocity and also the occupant presented a reduced injury risk when both passive safety systems are active.

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