Life Flight crewman Julian Burn said the man had been airlifted from the scene in a critical condition with life-threatening injuries.
In a separate incident a crash involving two cars on the Rimutaka Hill Rd on Saturday afternoon won the attention of a Stokes Valley squad of firefighters who were returning home after a major fire drill in Wairarapa earlier in the day.
Fire crews from several brigades were leaving Wairarapa when the two cars collided near the Rimutaka Hill summit.
Stokes Valley firefighters were first to the crash but stood down after Featherston Fire Brigade arrived.
The collision blocked a lane for half an hour and while the two drivers were unhurt, paramedics checked a woman passenger for injuries.
Meanwhile, a Masterton woman was taken to hospital after a car she was travelling in ploughed through a residential fence in the town yesterday.
A man in the car escaped injury in the incident, which happened about 12.30pm.
A stretch of Cockburn St was briefly cordoned off while firefighters cleared debris at the crash scene.