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Pedestrian access. In your video, it is shown at the center of a roundabout (traffic circle). You need to walk through traffic to get to it.
You can appeal the removal or submit it again as a new portal. In both cases, you will need strong evidence that a pedestrian can safely walk up to the portal without needing to actively avoid moving vehicles.
Edit: a quick Google search brings up this site:
There are no safe ways of reaching this that someone can see from Google Maps. If you want to appeal the removal, please make sure to include photos of safe access.
Portal además sin acceso peatonal no tiene un acceso peatonal seguro se encuentra con barreras de cadenas