In the "7.17" accident on the Zhangye section of the Lianhuo Expressway in Gansu, the maximum allowable total weight of the heavy semi-trailer truck was 49 tons. However, at Zhongsheng Mining Co., Ltd. in Cangzhou, Hebei, more than 70 tons of stone tar were loaded, and the actual total weight of the vehicle and cargo was 87.1 tons. Using an illegally installed jumping weight device, the truck entered the Cangyu Expressway from the Cuierzhuang toll station in Cangzhou City (the weighing scale showed only 31.45 tons) and headed to Jiayuguan, Gansu. When driving to the 2089 kilometer and 300 meter maintenance and construction section of the Lianhuo Expressway in Zhangye, Gansu, the vehicle lost control and collided continuously with 5 small buses and 2 heavy trucks waiting in line for passage. After preliminary investigation by the local public security organs, it was found that the heavy semi-trailer truck involved in the accident was severely overloaded and exceeded the limit. It passed through a long downhill section (the slope length of the accident section was 34.2 kilometers, with a drop of 687 meters, and the accident site was 14.9 kilometers from the top of the slope), resulting in brake failure and vehicle loss of control, which was the direct cause of the accident. The public security organs have taken criminal coercive measures in accordance with the law against the driver and actual owner of the heavy semi-trailer truck involved in the accident, as well as the relevant responsible persons suspected of illegal modification of the truck, illegal loading, and illegal weighing. At present, the relevant problem clues and the management responsibilities of relevant departments and personnel are still being further explored and investigated.

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