The Karino Interchange project was awarded on 8 March 2019 and completed on 30 September 2022, with a final value of R397.35 million. It formed part of the Maputo Development Corridor (MDC) Section 9, a key trade route between Gauteng and Maputo harbour. Works included upgrading the existing single carriageway to a four-lane undivided dual carriageway between km 62.950 and km 66.250, constructing a grade-separated partial clover quad interchange at Karino, and relocating the Crocodile Valley intersection to integrate with the new interchange. Major works comprised widening the Karino Spruit Bridge, rehabilitating the Crocodile River steel bridge, building an agricultural underpass, and constructing a four-span Karino Interchange Bridge with a post-tensioned prestressed concrete twin spine deck. Additional works included widening the N4 carriageway over a 4 km section, upgrading three major structures, and carrying out blasting, earthworks, drainage, asphalt surfacing, and associated finishes.
