Work is under way at seven bridge sites across Hawke's Bay as part of a New Zealand Transport Agency driven programme of structural improvements and safety upgrades.

An agency spokesman said the programme was expected to be carried out over the next few months and motorists could expect some slight delays at some sites.

To minimise disruption to traffic the bridge maintenance crews would be carrying out much of the work at night or over the weekends, and while most of the work would be going on under the bridges, and out of sight, motorists needed to stick to the temporary speed limits and traffic management systems which would be in place.

At least five of the seven work sites had the potential to affect motorists' journeys as temporary speed restrictions and some stop-go signalling had been put in place.

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Minor repairs as well as washing and painting is being carried out on the Karamu Bridge near Hastings while bridge joint work was taking place at the Mangatewai Bridge on SH2 south.

Crews were also at work on the Ngaruroro Bridge at Fernhill undertaking high-pressure washing as well as the installation of netting for wildlife protection while the renewal of two bridge joints was being carried out on the Mohaka Bridge on SH5 between Napier and Taupo.

Speed restrictions and stop-go signalling is also in place on the approach to and across the Tahaenui Bridge near Nuhaka on SH2 north while repair work was ongoing.

The northern stretch of SH2 is the busiest in terms of highway works and motorists can expect to strike delays.

Surface repair crews are working on the Morere Hill section while surface cleaning blasting crews will also be in the area.

Between Putorino and Tutira roadside tree felling is taking place and motorists can expect some slight delays at times as stop-go signalling and speed restrictions will be in place.

Drainage maintenance is also under way near Whakaki and around the Devil's Elbow section.

On the southern stretch of SH2 seal widening work is under way between Peka Peka and Mahanga with restrictions in place.