Widening of Tolo Highway between Island House Interchange and Ma Liu Shui Interchange

 (1998-2003) $717.5M

This main contract for the widening of Tolo Highway is a major civil works contract involving the construction of roads, drainage, and highway structures; marine works including dredging and reclamation; excavation and landscaping.

Tuen Mun Road

 (1974–1978) $222,000,000

The Tuen Mun Road is a dual 3-lane restricted access motorway linking the two industrial towns of Tsuen Wan and Tuen Mun in the western New Territories.  Sidelong ground, deep valleys and a tidal inlet necessitated the incorporation of 17 bridges in the design.  The road construction was divided into 7 contracts of which Kumagai were awarded 4 (about 75% in value).

Tai Po Bypass

 (1982–1985) $200,000,000

The Tai Po Bypass is a dual 2-and 3-lane road (part of the main link to Guangdong) through virgin country behind Tai Po.  Four of its five major bridges were re-designed to eliminate the need for 30m-high load-bearing falsework by employing incremental launching from one abutment.

West Kowloon Expressway

Northern Section

 (1993-1996) $1,270,000,000

Kumagai was in a joint venture with Maeda Corporation of Japan and China Road and Bridge Corporation of China for the construction of this 2.7 km dual 3-lane elevated expressway with 900m of distribution roads, 3 km of noise barriers and one interchange.  This was one of the Chek Lap Kok Airport core projects.

Wong Chu Road & Associated Interchanges Improvement and Noise Mitigation Works

 (1998-2002) $598,000,000

This major civil works project is carried out by a joint venture between Hong Kong Construction (Holdings) Ltd and AMEC International Construction Ltd.  Works include the construction of a dual two-lane carriageway, the widening of a slip road, the realignment of a section of Wong Chu Road, the extension of a pedestrian subway and extensive viaduct enclosures for noise mitigation. The completed road network will help alleviate heavy traffic arising from the proposed development of the Tuen Mun river trade terminal and a fourth industrial estate.