The NZTA's Wellington state highway manager, Rod James, said the topography of the road made it attractive to riders, "but it also means that it will always be a high-risk road, regardless of the weather or conditions, so motorcyclists can never afford to get complacent".
Fire services were also called to Lake Ferry Rd at 1.45pm, where Mr McKenna said a car had flipped on to its roof near the Pirinoa store.
An ambulance was called but it's understood the driver was not seriously injured.
Earlier, the Carterton Fire Brigade was called out to Carters Line to put out three small fires caused by brake pads.
Fire chief Wayne Robinson said it seemed the brake pads on some sort of trailer, possibly a horse float, heated up and fell off, causing three small grass fires on the roadside about 10.45am.
Last Easter weekend was the first with no fatalities in 57 years. The national manager of road policing, Superintendent Carey Griffiths, said this showed a difference could be collectively made by watching speed, wearing seatbelts, not driving drunk and maintaining concentration.
So far in the official holiday period, which began at 4pm on Thursday and ends at 6am on Tuesday, a 55-year-old cyclist died after his bike and a motor vehicle collided in Temuka, north of Timaru, on Thursday.