The project will be undertaken by South African firm Raubeck Construction.
The bridge has cameras and sensors that will mechanically enforce axle load limits.
This is part of the Trans-African Highway, which comprises a network of road projects.
Taj Mall, which opened in 2011, is said to have encroached on the road reserve.
The much-awaited 2km-viaduct still remains a project without a launch date.
The project is aimed at curtailing the number of accidents along the dangerous spot.
The project will be completed in two years at a cost of Sh2.3 billion.
The project is expected to gift Tanzania with its first high-speed railway.
World Kaihatsu Kogyo is finalising work on phase one of the Ngong Road dualling project.
The government hopes to launch construction works by August.
The LW3600-240NB stands at roughly 241 metres and lifts up to 240 tonnes.
The 715, with a 7.1m³ body and 12,750kg payload, sits in the mid-range of ADTs.
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