City of Johannesburg infrastructure development entity, the Joburg Development Agency (JDA), will start construction on the R260-million Watt Interchange next month, with construction expected to be completed in June 2019. This forms part of Work Package 15K for Section 15 of Phase 1C of the Rea Vaya bus rapid transit (BRT) system from Arkwright avenue to Chadwick avenue along Old Pretoria road, in Wynberg, Sandton.