Ensuring driving safety on agglomerate fog sections of mountain highways has been a persistent challenge for the Chinese transportation industry. To enhance driving safety in agglomerate fog environments by identifying key issues related to driving safety in such conditions. A summary of the influencing factors and research progress related to driving safety in agglomerate foggy environments was provided, both domestically and internationally. Firstly, the visual characteristics of drivers was examined and the causes of optical illusions caused by agglomerate fog was discussed. The "elephant trunk" curve was further analyzed that occured prior to the appearance of agglomerate fog. The relationship between human-vehicle roadway and traffic safety in an agglomerate fog environment was then clarified. Lastly, a summary of the current control measures implemented to ensure driving safety on group fog roadways was provided. The results show that the abrupt and significant reduction in visibility caused by agglomerate fog can lead to severe visual disruptions for drivers, resulting in illusions of distance and speed. In order to improve driving safety in agglomerate foggy environments, drivers are alerted through monitoring and warning systems. Additionally, a variety of inducement facilities are being developed to enhance visual entrainment. Future research is needed to study the visual demands of driving under the influence of complex factors from the perspective of reducing the impact of visual illusions.