Driver emotions play an important role in driving behaviour. Understanding how human emotions affect driving behavior is essential to enhance modern driver support systems, which aim at adjusting the mental and emotional states of a driver in order to improve road safety. In this paper, we first discuss the latest work on how to enhance driver emotions and how to improve driving habits with human emotion regulation, through the analysis of facial expressions, emotions, and driving behaviours of the subjects during different driving situations. Then, we study various driving support systems, and look at current findings and into potential applications of artificial intelligence for road safety via driver emotion regulation. Finally, further research directions are identified, and conclusions are drawn.