Filtered neighbourhoods typically allow motor vehicle access to all residences; you just have to use the designated route(s).
For many decades, housing estates have been designed like this anyway and millions of people live in cul-de-sacs without having any fear of dying because an ambulance or fire engine won’t be able to get through.
![](http://www.happycyclist.org/wp-content/uploads/2021/01/image-1-1024x536.png)
Information from healthcare trusts shows that schemes do not delay ambulances. In any case, emergency services are always consulted before any modal filters are installed.