On SH5 between Mohaka and Eskdale contractors are also at work installing ATP (audio tactile profiled) roadmarkings as part of the NZTA's Boost 2 Safety Contract.
The ATP programme includes features like rumble strips as well as profiled roadmarkings.
There are traffic control systems and temporary speed restrictions in place and motorists are asked to drive with caution.
Roadmarking is also under way between Mangapapa and Wairoa on SH38.
On SH50 between Omahu and Tikokino roadmarking crews will also be at work.
NZTA's expressway wire rope barrier installation and safety programme continues with three "active" sites being worked on.
Just south of Pakowhai Rd, and between Flaxmere Ave and Longlands Rd, wire rope barriers are being installed along the centre of the road.
Widening of the stretch between Taradale Rd and Prebensen Drive is also continuing.
Temporary speed limits are in place.