At around 5 p.m. on July 4 in Shangqiu, Henan Province, a black sedan was driving when the cement road ahead suddenly exploded from the heat and buckled upward, creating a raised concrete obstacle about 60 centimetres high that blocked the road. The driver braked urgently and fortunately avoided a collision, only small stone fragments hit the windshield.

Earlier that day, at 9:10am, the Shangqiu Meteorological Observatory issued a red high-temperature warning, forecasting that daytime temperatures in the city and surrounding towns would exceed 40 degrees Celsius (104°F).

In extreme heat, road surface temperatures can reach up to 70 degrees Celsius (158°F), causing concrete to expand and pressurise. If expansion joints are not properly installed or filled during construction, it can lead to explosive ruptures.

7月4日下午5时许，河南商丘，一辆黑色轿车在行驶过程中，前方的水泥路面突然热炸爆裂，拱起高度达60厘米，形成大块水泥障碍物阻挡道路。车主急忙刹车，所幸未撞上，仅挡风玻璃沾染石屑。

商丘市气象台于7月4日9时10分发布高温红色预警信号，预计当天白天，该市市区及所辖乡镇和街道最高气温将升至40℃以上。

高温天气下，路面温度可达70℃，会导致混凝土膨胀挤压，若施工时未预留伸缩缝或缝隙填充不当，易引发爆裂。

高温天气导致水泥路面热炸拱起60公分 车辆紧急刹车避险