(File image). Photo: RNZ / Rob Dixon In Auckland, there's heavy traffic on State Highway 1, north and southbound. NZTA also urged caution as wet weather settles in across the region amid heavier traffic with holidaymakers. Tomorrow, congestion is expected on SH1 between Puhoi and Wellsford and between Manukau and Bombay. Motorists are advised to allow extra time for travel if going through SH1 between Victoria Valley Rd and Makene Rd in the Mangamuka Gorge. Due to a repair work following a significant slip, A section of the highway has had to shut for all vehicles due to repair work following a significant slip.