The grey car ahead is that of a drug trafficker on his way to buy a large amount of drug. The cameraman is in a car of the french police drug squad, followed by another police car. The police captain (on the right in the cameraman's car) decides to intervene at a red light, but things don't go quite as expected. They didn't catch him later on.
This video is from the investigative programme Spécial Investigation on the drug market in France, that aired on french TV a few days ago
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