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Wish Red Cross would provide some data, but nevertheless that's very interesting way of reporting, 800 cars left Mariupol, 2000 people made it through Russian-occupied territory to UA side. That's 2.5person/car. Either cars leaving besieged city half empty, cars are grabbing coffee taking their time and still driving through Russian side or ...
Factions of the Ukrainian side have been, since very nearly the start of this thing, using civilians as human shields as a strategy. By most of the interviews I've heard, civilians are reporting that the Russians have been fairly helpful in trying to allow them to leave the combat zones when they can. This makes logical sense, and most of the actual evidence that I can see backs that up. This is a good case-in-point where as the Russian gain control, freedom of movement seems to be restored.