This study examines the degree to which construction sector employees perceive that safety is important in their organizations/sites and how job satisfaction affects these perceptions when age is introduced as a moderator variable. Two-way analysis of variance demonstrated that job satisfaction has a strong effect on perceived management commitment to work safety and that this relationship was moderated by respondents' age. Job satisfaction was associated with perceived accident rate and safety inspection frequency, but the proposed role of age in this linkage was not confirmed. Consequently, the findings indicated that by increasing the level of job satisfaction, perceptions of these safety climate aspects proved to be more positive. The conclusion is that these relationships could further lead to a lower percentage of accidents and injuries in the workplace and better health among employees. A significant relationship between job satisfaction, age and perceived co-workers' commitment to work safety was not found.

– The objective of this paper is to present the assessment of external transport costs in Republic of North Macedonia from air pollution. Externality is a cost or benefit that is transferred and affects other parties that are not directly related to the project, but they are not financially compensated. The approach for evaluation of monetary values of transport air pollution is based of estimation of these costs in relevant EU studies. Keywords – External costs of transport, air pollution

There are more factors from bond vehicle -road condition that have significant impact on driving comfort on the road. One of indicators in this bond is roughness of roadway surface (smoothness), and with this indicator safe and comfortable driving at designed speed on particular roadway is ensured.One of the most important surface parameters of every roadway is longitudinal roughness which is functionally connected with maximum allowed driving speed. Longitudinal roughness, expressed through International Roughness Index (IRI) is significant parameter which have to be achieved on pavement surface.The occurrence of excessive plastic deformation, fatigue and the appearance of cracks in the pavement structure are factors that require on-going quest for a technical solution in order to obtain high quality flexible road construction especially for highways and roads with very heavy traffic load. Applying a design solution by overlaying or one-layer upgrading of pavement structure, is usually limiting factor in achieving of the required roughness.