But they will be able to travel without a permit, it's just that those journeys may need to be rerouted to take a less direct route to avoid the traffic filters

But they will be able to travel without a permit, it's just that those journeys may need to be rerouted to take a less direct route to avoid the traffic filters. Traffic filters are not new to the UK, and plenty have existed for decades in cities like London without controversy or conspiracy. They do not form an impermeable cordon around an area. They restrict through traffic on certain streets, in order to provide faster and safer routes for either bikes or buses. As far as I can tell the Oxford proposal is less restrictive than traditional filters as permits allow car driver to bypass the restrictions a certain number of times a month.