Notwithstanding roads with gridlocked traffic conditions (as also outlined in LTN2/08, when protected space is necessary for a different reason than safety) on 17 December 2014 the Committee adopted London Cycling Campaign’s Motion 3/2013 verbatim:
When do we need protected space for cycling?
1. We believe ‘safe and inviting’ cycling environments do not compel cyclists to share space with high speed or high volume motor traffic.
2. Cyclists should not be expected to share space with motor vehicles moving above 20mph.
3. If cyclists will share space with motor traffic, volumes must be low. On the core cycle route network this should not exceed the Dutch maximum for main cycle routes, 2,000 Passenger Car Units per day.
4. In assessing schemes where current motor traffic speeds or volumes are too high we will expect to see either (i) specific measures to reduce both motor traffic volumes and speeds to levels acceptable for sharing or (ii) high-quality protected cycle infrastructure.
5. Where schemes are inadequate, and depending on context (e.g. residential streets vs. main roads) we will push for high-quality protected cycle infrastructure and/or measures to reduce both motor traffic volumes and speeds to levels acceptable for sharing.
Please refer to the full text of the [London Cycling Campaign] Policy Forum document When Do We Need Protected Space for Cycling, 9 August 2013.
There’s also a detailed explanation of this motion here.