She also laid the foundation stone of a 16.5-km elevated expressway and launched three other projects.
The six projects, under the Chittagong Development Authority (CDA), are estimated to cost about Tk 50 billion.
The 1.57-km Kadamtali Flyover has been built at a cost of Tk 582.2 million.
CDA Chairman Abdus Salam told the media in the port city on Thursday that the Chittagong Port would fund the construction of the elevated expressway, estimated to cost Tk 29.57 billion.
CDA would repay the port from toll tax collected for the use of the road, he said.
The three other projects the prime minister launched include the construction of a road—called the Outer Ring Road—from Patenga to Faujdarhat and a road linking Bayzid Bostami and the Dhaka Trunk Road.