I quoted this in another comment but I think it's worth repeating:
"When [the traffic filters] are operating, private cars will not be allowed through the filters without a permit."[1]
"Residents [of the area affected by the traffic filters] will be able to apply for a permit to drive through the traffic filters for up to 100 days per year"[1]
1: https://www.oxfordshire.gov.uk/sites/default/files/file/road...