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.
The 77 kilometre road will be upgraded from gravel to bitumen standard.
The Chinese are using the hanging basket technique to tackle challenges.
Work was expected to begin by end of this month and tenders had already been floated.
The project is aimed at curtailing the number of accidents along the dangerous spot.
Rising costs of roads rehabilitation is becoming a huge burden to the government.
The firm was picked from a group of eight companies that were in January invited to bid for the work.
Sinohydro Tianjin Engineering Limited will install the footbridges at a cost of Sh880 million.