The New Zealand Transport Agency is warning motorists about major roadworks starting on May 21 along State Highway 2, Takitimu Drive.
The works will rebuild the northbound lane between Elizabeth Street and Chapel Street, which carries most of the heavy traffic towards the harbour bridge in Tauranga.
Bay of Plenty system manager Rob Campbell said motorists could expect significant delays for the next three weeks.
He asked them to use an alternative route if possible.