Work is due to get underway in November and last around 12 months.
Chinese multinationals are now warming up to other sectors of the economy.
There are speculations that the project has been abandoned.
The government is currently sourcing for financing for the 10-kilometre road project.
The bridge has cameras and sensors that will mechanically enforce axle load limits.
Engineers are undertaking soil tests to help inform the final design of the overpass.
This is part of the Trans-African Highway, which comprises a network of road projects.
Since February 2014, Kenyans have eagerly waited for the launch of the project.
Construction of the cable cars system is expected to begin in December.
Top Washington official tours Nairobi to inspect U.S. funded projects.