Can you outline TfL's policy with regards to assistance offered to those with visual impairment in it's street management, Including: 1. Details of the visual, audible and tactile assistance offered by TfL at its crossings. 2. Information in regard to the advisory support that TfL receive in preparing policy and procedures from the various experts and advisory/support groups with expertise in this area. 3. Provide details of the assistance offered at each of the crossings maintained by TfL throughout London and the advice and assistance offered to boroughs. 4. Information as to the maintenance routine and checks done to maintain the upkeep of those aids, together with the frequency of those checks. 5. Advice and contact details for the public on how to report faults or repair issues, as well as make requests for or suggestions for improvements.