Motorists are being asked to plan ahead to avoid delays on Waikato and Bay of Plenty roads from this weekend.

Drivers may encounter speed restrictions and other traffic management on state highways around the regions.

Roadworks may cause delays for some motorists this weekend. File Photo.

In Tauranga, State Highway 29A between the Hairini and Poike roundabouts will be closed overnight while a 46-metre overbridge is put in place.

State Highway 29A will be closed from 7pm Saturday, October 1, until 7am on Sunday, October 2.

Light vehicles can use Ohauiti and Poike roads, while trucks will be detoured down Turret Road, 15th Avenue and Cameron Road.

The Poike Road Overbridge will eventually connect Ohauiti with the Waiariki Bay of Plenty campus.

'While on State Highway 29, east of the town of Te Poi, work will be completed on the surface of the road,” says a statement from the NZTA.

'This work will take place from 7am to 6pm Monday, October 3, until Saturday. Traffic disruption is expected to be minor but the road will be left unsealed.”

In the Waikato, State Highway 3 south of Mokau is now open to one lane with a Stop/Go in place, following the slip which occurred in the area on Sunday September 18.

In the Coromandel, this week's wet weather has caused slips on SH25 north of Thames with one at Tararu and another at Waiomu.

Traffic is single lane with vehicles passing under stop/go while the sites are monitored. Further north work has begun on a 40 metre retainer wall at the site of a slip 9km south of Coromandel town, also on SH25. The site remains single lane under stop go.