The pavement on the eastern side of Blackfriars Bridge has been closed to the public for the next two and a half years during the construction of the new Blackfriars Station.
According to the website of the Thameslink Programme, Transport for London "made this decision in the interests of pedestrian safety and after consultation with Network Rail, the City of London and the London Borough of Southwark".
"The safety concern is that pedestrians could become stranded at the edge of the Blackfriars redevelopment work site on the eastern side of the north end of the bridge where the station building work temporarily requires the suspension of the road crossing between the east and west pavements."
A new temporary entrance to Blackfriars Station – for ticketholders only – has recently opened on the riverside walkway on the north bank.
The much delayed Thameslink Programme (formerly Thameslink 2000) will expand capacity on the north-south rail line and will involve major works at both Blackfriars and Borough Market.