Acknowledgement: This work is partly funded by SAFER Vehicle and Traffic Safety Centre at 12Chalmers and Chalmers Area of Advanced Transport. The work was carried out within the 13 SAFER collaborative environment. We thank the reviewers for their constructive feedback. 14 15 Objective: To outline a conceptual framework for understanding driving style and, based on 19 this, review the state-of-the-art research on driving styles in relation to road safety. 20Background: Previous research has indicated a relationship between the driving styles 21

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