Freedom of Information requests relating to this aborted road safety campaign show that the lead officer for Vision Zero, the Chief Safety Health & Environment Officer, did not sign off the campaign. Why not?

The Chief Safety Health & Environment Officer was consulted on the campaign before it went live. Feedback was given and taken on-board, however the responsibility for sign off for media campaigns sits with those responsible for developing marketing campaigns, which at the time was led by the Managing Director of Customers Communication & Technology at Transport for London.