The NZTA is warning motorists to be prepared ahead of mass Auckland motorway closures starting on Sunday night.

Multiple highways will be affected across the region over the next week - including SH1, SH16, SH18, and SH20 - to allow for motorway improvements.

"There is a wide range of overnight roadwork closures planned on the Auckland Motorway network for the upcoming week (5-11 May) including lane closures on SH18 between Tauhinu Road and Greenhithe between 5-7 May," the NZTA warns.

"Closures start at 9pm and finish at 5am, unless otherwise stated."