The London borough of Hammersmith and Fulham is obliged to consult the Ministry of Defence under the provisions of the Wormwood Scrubs Act 1879 on development proposals on Wormwood Scrubs. Development proposals are defined in Section 4 of the Act as
... lay out, drain, level, plant and improve the Scrubs."
The definition covers all but the most minor of works. Therefore the requirement for this Department's approval would depend on the nature of any works needed under a proposed traffic management scheme.
I have previously referred to a related agreement in the form of a Memorandum of Agreement dated
The Secretary of State for Defence agrees for the purposes of the Act that the Greater London Council may carry out on the non-military portion of the Scrubs any operation to lay out drain level plant and improve the Scrubs without requiring his further approval provided the operation is otherwise lawful and does not form part of a major scheme likely to affect the general character of any part of the Scrubs and does not require the consent of the Secretary of State for the Environment."
Public roads would not be a military part of the Scrubs.
Therefore the Ministry of Defence would expect to be consulted if the Council proposed a development falling within the definition of the Act over the military portion of the Scrubs or was a major scheme.