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Since Sheffield sees regular unofficial car meets that draw large crowds, and this event drew police attention due to its scale, here's the primer:

Large informal gatherings of car enthusiasts, sometimes called "car meets" or "cruises", have become a recurring feature in cities across the UK, including Sheffield. These events are usually organised informally, often via social media, and can attract hundreds of modified or performance vehicles to a single location, typically car parks or industrial estates, with little or no official oversight.

Such gatherings have repeatedly drawn concern from police and local residents because of issues like dangerous driving, noise, obstruction of roads, and the sheer scale of traffic they generate in a short space of time. South Yorkshire Police, the force covering Sheffield, has previously monitored and responded to similar events, balancing road safety enforcement against the fact that attending a car meet itself is not illegal.