It is London Cycling Campaign policy generally that cyclists should not have to share roads with fast or heavy traffic. LCC passed a policy motion in 2013 that set the criteria that we expect for a cycle network: on network roads where cyclists do not have physically segregated space, motor traffic should not be faster than 20mph, nor have volumes above 2000 PCU (Passenger Car Units) per day. On roads where these criteria are not met (that is, busier or faster through-routes), segregation needs to be provided.
It is clear that to achieve these criteria along with a high enough 'mesh density' for the cycle network (cycle routes spaced at about 250m is the Dutch recommendation), many of the less important roads in Brent which are insufficiently wide for segregation would need measures that prevent them from being used as motor-traffic through-routes, such as road-closures with cycle gaps or opposing one-ways with cycle exceptions. (Note that methods exist to allow buses to still use such routes if desired.)
The proposed Motoring Grid represents an attempt to define which are the roads in Brent on which general through motor traffic should continue to flow (mostly A and B roads), and which (other) roads should become through-routes for bikes, pedestrians and possibly buses only.
The Motoring Grid roads (in black) would be expected in due course to be provided with segregated or semi-segregated cycle tracks if phsically possible.
The remaining roads would continue to allow access by motor vehicles to all addresses, but would not be through-roads for cars. These roads would therefore become what the Dutch call autoluwe, or almost car-free roads: places where cycling and walking dominate, and where residents' quality of life is placed above the needs of motor traffic.
Our suggested Motoring Grid here is a work-in-progress, and not definitive, but intened to demonstrate the principle of this long-term vision of a borough that allows everyone to move about by car if and when they need to, but ends the domination of the environment by the car and enables universal non-motortised mobility.