## 7 Discussion of the Results  
The investigation was started on the impact of the implemented quality management system of the PTI on the evaluation of the technical condition of vehicles at these PTIs, showed that the PTI with established quality management system according to STN EN ISO 9001 on average assessed the technical condition of vehicles with a higher degree as temporary roadworthy and not roadworthy for road traffic as opposed to the PTI which met only the minimum requirements for quality management by a documented procedure (internal regulation).  
Further research revealed that of the selected eleven Member States of the European Union, the first six countries in which PTK achieved the highest average rate of temporary roadworthiness and not roadworthiness of vehicles for road traffic, were compulsorily accredited or certified according to ISO standards (most often ISO/IEC 17020). Both of the cited research findings can be considered a positive phenomenon, as this excludes more technically not roadworthy vehicles from the road traffic, which pose a potential threat to safety or to the environment.  
Since the above research shows that certification according to STN EN ISO 9001, or the even higher accreditation according to ISO/IEC 17020 has a positive impact on the quality of PTI activity, it would be absolutely necessary to introduce legislation for PTI in the Slovak Republic as well as in other Member States of the European Union concerning the obligation of accreditation according to (as it is the most suitable for the activities of the PTI) STN EN ISO/IEC 17020 (inspection authority type \"A\"), as one of the most effective measures to improve the quality of the PTI activities. Due to the fact that the quality indicator of the PTI is given by the highest possible percentage of vehicles assessed at the PTI as temporarily roadworthy or not roadworthy for road traffic, the higher quality of the PTI activity results in less technically not roadworthy vehicles in road traffic and thus higher road safety.  
However, it is debatable whether the better quality of PTI activities is directly related only to the established quality management system according to the ISO standard, or it is also the result of several systematic measures that are applied together with quality management in organizations. It is probable that organizations that are interested in improving the quality of their activities also employ other means to achieve this goal, and the accompanying phenomenon is accreditation or certification according to the ISO standard. Given that there is almost no research or work in this area, it is almost impossible to answer this question unambiguously. Therefore, in the future, research could be carried out focusing on whether other procedures or management methods different from the PTI without this certification or accreditation are applied to the PTI with certification or accreditation according to the ISO standard.  
As for the overall quality of PTI's activities in the Slovak Republic, it should be mentioned that it has improved rapidly over time, even though it still does not reach the level of more advanced European countries. This was mainly due to the introduction of a camera system at the PTI, through which the supervisory authorities control the technicians' activities and when discovered, they are sanctioned for violations. However, the rate of detected violations of regulations and fraud by PTI technicians in the Slovak Republic is still high. On the other hand, it is also necessary to mention that the rate of traffic accidents due to technical errors of vehicles is very low in the Slovak Republic. Whether this is a consequence of the activities of PTIs or just the consequence of a methodology for determining such accidents is debatable and justifies the need for further research in this topic.