A motorist filmed a car driving on the wrong side of a busy stretch of road moments before it collided with another vehicle, killing two elderly women, police say.
The crash happened at about 10.45am today on the Waikato Expressway north of Huntly, where the north and southbound lanes are divided by a median barrier.
"There's two lanes south, two lanes north. You've got a wire rope which separates the two and they were completely on the wrong side of the road,'' said Waikato road policing manager Inspector Leo Tooman.
It appeared the women entered the southbound lanes at the Ohinewai Interchange and drove about 1.5km before their northbound car collided with an oncoming car.
Mr Tooman said police would analyse footage shot by another motorist, of the car travelling on the wrong side of the barrier moments before the crash.