An extensive maintenance and repair project on the Mohaka River Bridge on SH5 between Napier and Taupo is under way and will see a single lane and speed restrictions in place until the end of next month.
A speed limit of 30km/h has been imposed and will be in place continuously until then.
Temporary traffic lights have been set up as a single lane across the centre of the bridge has been put in place.
Heavy transport operators have been advised that the gross permitted weight for a single vehicle is 60 tonnes, with drivers requested to ensure there is a clear separation of at least 40m between crossing trucks.
Delays of up to five minutes can be expected.