UpdatedNZ Herald19 Jun, 2026 05:17 AMQuick ReadMotorists are being advised to expect delays on SH1 north of Wellington following a serious crash. Photo / GoogleA serious two-vehicle crash has closed southbound lanes on State Highway 1 north of Wellington, causing heavy delays for rush-hour commuters.Emergency services were called to the Johnsonville Porirua Motorway about 4.40pm after a collision occurred in the southbound lanes between the Tawa-Grenada North on-ramp and the Churton Park-Glenside off-ramp.