A roadmarking programme across Hawke's Bay will see contracting crews at work on all the region's main highways and motorists are being advised to keep the speeds down when passing them.
A New Zealand Transport Agency spokesman said roadmarking teams would be at work on SH2 north, SH5 between Napier and Taupo, SH50 and SH38.
"Care is needed when passing the roadmarking vehicles," Hawke's Bay system manager Oliver Postings said.
On SH2 marking crews will be working between Wairoa and Morere, with other contractors carrying guardrail and widening work just north of Wairoa.
Later this week a drainage maintenance crew will be working near Tutira and delays are expected as temporary speed limits and stop-go signalling will be in place.