This photo is at location 6. These contra flow signs tell road users that they can expect to meet cycle users coming up Cannon Street in the 'wrong' direction. This is excellent, and all one-way streets should be contra-flow for cycle users as a default, meaning that there has to be good reason for them not to be contra-flow, rather than the opposite. Note that from location 4, this is the first sign in this direction that tells you that this is a cycle route. And it doesn't even have the destinations.
