Free Traffic Legal Advice

If the restrictions are part time the times must be shown on the entry signs.

Low traffic neighbourhoods mean you can access any address but you need to do so by certain roads. Some have exemptions for blue badge holders. 

School streets are different as they do prevent access at either end except for residents of the road and others such as teachers possibly.

There are other measures such as banned turns at peak hours.

All told there are about 25,000 low traffic schemes of various types in the UK, some of which have been in place for decades.

You haven't said where and what this scheme is so it's not possible to say anything specific.

The DfT operational guidance which has since been withdrawn advised

10.65 Registration with the TEC can be transferred to the Sheriff’s Court in Scotland so that enforcement can be carried out against a motorist whose vehicle is registered at an address in Scotland. However, registration against a motorist whose vehicle is registered at an address in the Isle of Man, the Channel Islands or a foreign country cannot be enforced.

I don’t believe this has changed. Therefore it’s surprising that courier companies and many other companies don’t take advantage of this to avoid paying PCN’s. Most councils write off PCN’s issued to vehicles registered to a Scottish or Northern Ireland address because the costs and admin involved to transfer debt registration to their court system is too timely and costly that it's not worth it.

Interesting you assume no PCN for entering and leaving through the same road.

Makes absolute sense but let's see if Redbridge have the intelligence to set it up this way.