Holidaymakers are heading back to Auckland in droves, causing traffic jams between Wellsford and Puhoi.
Waka Kotahi New Zealand Transport Agency is warning motorists to expect delays between Puhoi and Wellsford in both directions with southbound traffic expected to be heavy until about 6pm.
Images show northbound traffic almost at a standstill heading into the Johnstones Hill tunnel.
"Be prepared for heavy traffic southbound on #SH1 between Puhoi and Wellsford from 8:00am - 6:30pm today as motorists return to Auckland following the holiday period," the organisation's Twitter account warned this morning.