Sir: For three weeks now, the Defence Housing Authority, Karachi, has been unsuccessfully trying to maintain one-way traffic from Khayaban-e-Shaheen to Khayaban-e-Ittehad and Creek Vistas. Police officers are deployed at the end of each road to guide the commuters. The problem is that more than 20 roads fork into Khayaban-e-Shaheen. Unless signposts are placed there will be complete chaos and danger of traffic accidents. SHAKIR LAKHANI Karachi