Polish police have detained a 52-year-old man after a fatal multi-vehicle crash on the S12 expressway near Janowka in Lublin Voivodeship. A truck driven by the man entered a slowdown before a bottleneck created by roadworks. One woman travelling in a Volkswagen Polo died, while six other people were taken to hospital for checks, including three children. Police said the accident happened on the S12/17 stretch where construction reduced the roadway width. Vehicles were stopping or significantly slowing down before the work area. Investigators established that the truck struck cars ahead, triggering an “effect domino” sequence that led to further collisions. The first vehicle hit was the Volkswagen Polo, which suffered serious damage. Another car, a Peugeot, was also involved, and its passengers were among those sent to hospital. Police reported that the truck driver was sober. He was arrested and placed in a police cell. Prosecutor-supervised investigators are carrying out procedural steps to determine the course of events and the causes of the crash. The S12/17 area remains fully closed, with diversions in place for traffic via the node Swidnik along a service road toward Piask. The investigation continues while the detained man remains in police custody.