Romain Sacchettini, of Queenstown, said he was driving to Christchurch on State Highway 8 between Omarama and Twizel when a Maui campervan overtook him into oncoming traffic.
The near miss happened on February 6, but he was keen to get the message out after police failed to act on a complaint he made at the time.
The incident happened on the same stretch of road where there have been three crashes in the past few weeks.
"When it happened, I was not angry, I was just scared.
"My hands were shaking and [my] heart was racing — I was in shock.
"Afterwards, the campervan didn’t slow down or stop, but they did speed up."
They continued to travel at that speed for about 20 minutes.
"There is a difference between making a mistake, overtaking at the wrong time, or just making the wrong decision, and travelling at 140kmh for 20 minutes.
"That’s just extreme recklessness."
While the campervan driver demonstrated very poor decision-making, this was not an isolated incident on that stretch of road.
"I’m not pinning this specific driver to the wall. They are just someone ... that did a really bad act of dangerous driving.
"The point is we need agencies such as the police to step up."
An increased police presence and the installation of a permanent speed camera along the stretch of road would go a long way as a deterrent, Mr Sacchettini said.
He reported the incident to police, but never received a response.
In his report to them, he included the campervan’s number plate, a detailed rundown of events and dashcam footage, as well as photos and videos.
Police could not locate his complaint and did not respond to any further questions by deadline.
