While the provision of cycling infrastructure is to be welcomed, London's so-called Cycle Superhighways are currently not adequate for their purpose. I'm a regular user of CS7 and there are far too many points on this route where the cycle lane essentially disappears and cyclists are forced to negotiate their way through traffic. A good example is heading south on the A24, as one approaches the junction with the A25.
Further, there are numerous points on this route where cars are often found parked in the cycle lane, which totally defeats the purpose of having it - the A24 between Tooting Bec and Tooting Broadway is particularly bad for this. Again, this forces cyclists to merge with traffic.
Apart from putting existing cyclists in danger, there is no doubt in my mind that these issues are preventing more Londoners from taking up cycling, as CS7 in its current form cannot really be considered completely safe, particularly for an inexperienced cyclist.