In the project "A holistic approach to increased traffic safety", a pilot study of Postnord Logistics' operations in Sweden was performed to investigate the cause of accidents in long haul, regional and urban distribution. This was achieved by taking a holistic approach, and by focusing on vehicles, drivers and organisation during the investigation, all of which affect the risk of accidents. The results from the project showed that the way of prioritising and working with safety in an organisation, i.e. its safety culture and climate, plays an important role in how well a company performs when it comes to safety. The aim of the project is to increase knowledge and develop methods to improve safety at transport companies by improving the safety climate. The model focuses on organisational changes and was tested and evaluated in a case study at a Gothenburg branch of Postnord in Sweden. A way of working to improve the safety climate at transport companies was developed and tested with Postnord. During the one year of testing a change process started at the studied branch of Postnord, but it did not lead to measurable improvements in the safety climate survey or in the amount of accidents. A key-factor to implement new ways of working is time. Therefore, one year was probably too short a time to measure any significant changes in the safety climate. Two other findings which are crucial for improved safety climate are the management’s commitment and to anchor changes in the whole organisation. Moreover, efficient communication channels in the company are important to achieve the changes for improved safety in the whole organisation.