Trinity Square re-instated left turn plans
Request ID: FOI-2891-1718
Date published: 31 January 2018
1. detailed plans for the planned layout of Tower Hill, Byward Street, and Trinity Square, following the current works to allow a left turn from Byward Street into Trinity Square at all times. This should include details of the road markings, traffic light layout, and proposed phasing; 2. the planned diversion for the East-West Cycle Superhighway for periods during the works when access cannot be maintained along the normal route; 3. Please also tell me if you have performed any assessments of the potential impact of increased traffic on Trinity Square following the re-instatement of the left turn - particularly if you have assessed the risk of left-hooks, vehicles blocking the junction, or pollution on Trinity Square and surrounding streets.
Our Ref: FOI-2891-1718
Thank you for your request received on 10 January 2018 asking for information about Trinity Square.
Your request has been considered in accordance with the requirements of the Freedom of Information Act and our information access policy. I can confirm we do hold the information you require.
Please find attached a plan of the proposed layout for the Trinity Square junction post construction, including road marking layout and phasing of the signals. During some portions of the construction work it will be necessary to close the East-West Cycle Superhighway in order to ensure road users are safely protected. The disruption of this has been kept to a minimum and diversion plans are in place to ensure adequate cycling facilities are provided.
The design for the Trinity Square junction includes a hold the left facility. This will provide cyclists with their own dedicated set of traffic signals. When cyclists get a green light the left turning traffic into Trinity Square will be held at a red signal. Cyclists will then be stopped by a red light whilst motorists turn left, cyclists and motorists never get a green light at the same time, thus reducing the potential for conflict. Pre the East-West Cycle Superhighway, the left turn from Byward Street into Tower Hill was allowed at all times including the right turn from Byward Street into Trinity Square. As part of the new proposals, the right turn into Trinity Square from Byward Street will not be allowed, however the left turn will be at all times.
The reinstatement of the permanent left turn and the method of access to the junction has been discussed at length with the Trinity Square stakeholder group including key businesses and also local councillors and London Boroughs. The number of vehicles using Trinity Square should not increase prior to installation of the East-West Cycle Superhighway as the right turn from Byward Street is still not a permitted movement. With regards to vehicles blocking the junction, the method of control and the technology in place will ensure that traffic does not block the junction and turning movements are not constricted. The junction will be monitored closely post implementation to ensure junction efficiency and journey time reliability.
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FOI Case Officer
FOI Case Management Team
Transport for London
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