Group 1 - The cold wave weather has caused the minimum temperature in high-altitude areas of the Jingzhu North Expressway to drop to -2°C, leading to icy road conditions on the Yunyan section [1] - To ensure road safety, temporary traffic control measures were implemented starting January 20 at 19:00, including exit diversion and entrance closures for certain sections of the Jingzhu North Expressway [2] - Road maintenance teams have repeatedly spread de-icing agents on the affected sections to mitigate icy conditions [4] Group 2 - Drivers are advised to closely monitor weather and official road conditions, avoid controlled sections, and be cautious during nighttime when temperatures are prone to cause ice formation [5] - Recommendations for safe driving include reducing speed, maintaining distance, and using tail lights, especially on icy roads, while electric vehicle users should check battery range in advance [5] - In case of traffic congestion, drivers are urged to follow guidance and remember the protocol of "pulling over, evacuating, and calling for help" in case of accidents or breakdowns [5]