Here is an ambitious plan for a Bicycle Boulevard from Shoreditch to Fitzrovia, along Old Street, Clerkenwell Road and Theobalds Road, open only to bicycles, buses and motor traffic for local access only.
a. It is now the most cycled route in London, showing that it is the desired EW route.
b. It is of variable width, therefore trying to accommodate bikes, buses, and through traffic in a consistent and safe way is impossible. In other words, a compromise will be a botch job.
c. There will not be mixing of buses and bicycles: bicycles will have a dedicated two way cycle lane on the South side of the street.
d. The Boulevard stops being a mega- EW-rat-run. Motor traffic will have to use Pentonville/City Road.
More details here: https://docs.google.com/presentation/d/1yw9mkHhGZaVBKYJs6FxyhC1Z4nNYVl-IFH-aR1ScK9U/pub?start=false#slide=id.p