Truck driver Brett Sullivan was heading back to the yard to knock-off for the day when he came across a car crash.
Sullivan, who works for Hawky Haulage, was driving near Kaukapakapa, northwest of Auckland on Saturday afternoon, when he spotted a car that had rolled.
"It must've happened seconds before I came across the corner and there was a car in front of me that had stopped.
"They were running back towards the car and I could see someone's arm floating around through the windscreen.''
Sullivan, who was a volunteer firefighter for 16 years, said his instincts kicked in and he shot out to see how he could help, as other people called emergency services.