The current ridership of the first line is 55,000 passengers per day, with a total of 109 km of dedicated bus routes.

[3] Upon completion, it will become the largest BRT network in Pakistan, and will connect to the Karachi Circular Railway.

[6] Nawaz Sharif, during a high-level meeting in Karachi on 10 July 2014, announced funds to launch the BRT Green Line to alleviate the severe traffic congestion in the city.

[12] Engineering Associates had been contracted as the designers and supervision consultants for Green Line while a Consortium of "Ernest & Young", "Exponent Engineers" & "Haider Mota & BNR" had been contracted for "Transaction Advisory for Bus Operational Plan".

The orange line: The Blue Line will extend from Merewether Tower in central Karachi, to Bahria Town in northeast Karachi at a total length of 30 km (19 mi) along Jahangir Road, and Shahrah-e-Pakistan to Sohrab Goth and onto Superhighway.

[22] Provincial Minister for Transport Syed Nasir Shah told Jang that the Blue Line will have 9 stations with 3 of them underground.

[25] Construction of the line was delayed due to the global coronavirus pandemic, and is expected to start in 2022, with completion in 2025.

Construction was to start in August 2020, but was delayed to 2021 due to the global coronavirus pandemic,[28] and was originally planned to be completed in 2022 at a cost of $503.2 million.

[27] A facility will be established at Cattle Colony to produce 11 tonnes of biogas per day for the line's 213 buses.