Police advised motorists the road would be closed for some time.
Fire communications shift manager Scott Osmond said three trucks were called to the scene of the crash.
He said the fire crews managed to extricate the trapped person fairly quickly.
Meanwhile a severe weather watch remained in place for parts of the South Island this afternoon.
MetService said the heaviest snowfalls were expected above 300 metres around Southland, southern parts of Fiordland, and Otago. In Clutha 10 to 15cm of snow was likely in places through to tomorrow morning.
"This amount of snow has the potential to be very disruptive affecting many higher roads and passes and making driving conditions hazardous," MetService said on its website.
"Livestock could also be affected, especially those without shelter.