This diploma thesis deals with passively safe polyethylene roadside bollards (PSB). The
main problems are their compliance with the current Slovenian legislation as well as the
unwanted and inadvertent damage that occurs in their application. The literature section
focuses on the Slovenian Rules on Traffic Signs and Equipment on Roads. European
standards, valid in Slovenia, are presented as well as the calculations that the Slovenian
rules dictate. In the practical part of the thesis, the procedure is designed for calculating the
load of PSB during ploughing. The course of measuring snow density and the design
solution of the base that prevents the unwanted twist of the PSB are also presented. The
results have shown that under normal conditions the PSB undergo ploughing without
difficulty; two crucial factors are the speed of the plough and snow density. As far as
ensuring passive safety goes, it is best to leave the PSB geometry as it is; more attention
should be paid to removing snow from the carriageway.
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