The improvements of the FT1 route was also being implemented within the Federal Territory of Kuala Lumpur as well, in order to improve the highway network within the city. Lack of proper highway planning was blamed for the severe congestion in the city. At that time, the FT1 route within Kuala Lumpur consisted of Jalan Cheras, Jalan Pudu, Jalan Tun Perak (formerly known as Java Street and then Mountbatten Road), Jalan Tuanku Abdul Rahman and Jalan Ipoh (both previously known as Batu Road). Under the recommendation from the 1979 Klang Valley Review Report, the FT1 route in Kuala Lumpur was rerouted to a new road system consisting Jalan Loke Yew, Jalan Maharajalela, Jalan Kinabalu and Jalan Kuching as a traffic dispersal means as well as providing the constant continuity of the FT1 route in Kuala Lumpur. One of the components of the new road system was the Jalan Kinabalu viaduct, which was opened on 15 March 1963.