The highway has been split into three sections for construction works totaling 50.4 km.
Thika Superhighway was completed and officially opened in 2012.
The project is fully-funded by the Kenyan government to the tune of Sh10 billion.
The project begins with building the first three of 32 planned berths at Manda Bay.
The project, with lighting and a footbridge at the KWS gate, will conclude in 15 months.
The road is part of the State's new plan for the Nairobi Urban Toll Road project.
This is the largest EPC contract that Isolux Corsan has undertaken in Africa to date.
Tanzania laments that Kenya's plan is equivalent to sabotaging its economy.
The regional road project is expected to help ease transport crisis in East Africa.
Locals urged to improve their standards so as to compete with Chinese firms.