The registered owner of the Triumph motorcycle was a male but the gender of the rider had yet to be determined, he said.
With three days left in the official holiday period, the road toll stands at six and now equals that of the entire holiday period last year.
The Christmas-New Year holiday period runs from 4pm on Christmas Eve to 6am on January 3.
A 46-year-old woman was killed in a collision between a car and a bus in Hamilton yesterday.
She was named by police today as Lynelle Joy Bray of Hamilton.
Emergency services were called to the four-way intersection of Forest Lake and Te Rapa Roads and Ulster and Victoria Streets just before 5pm.
A male passenger from the car was taken to Waikato Hospital with suspected arm injuries.
No one from the bus was hurt.
Acting Waikato road policing manager Inspector Marcus Lynam said the intersection was controlled by traffic lights.
It was too early to comment on the cause of the crash but checking the sequencing of the traffic lights would be a focus of the investigation, he said.
A 4-year-old Masterton girl who died when the car her mother was driving left the road and flipped yesterday was named by police yesterday.
Kahui Matauwhati was pronounced dead at the scene when the family's Isuzu Bighorn 4WD crashed near Taumarunui in the central North Island on Sunday.
An 11-month-old girl died on Saturday when the van her mother was driving left the road on the Kapiti Coast, flipping up to six times before landing on its roof.
The woman, in her early 30s, was flown to Wellington hospital in a serious condition.
The baby's father, a passenger in the van, escaped the crash with minor injuries.
One person died and two others were injured in the head-on crash between Te Anau and Mossburn in Southland on Sunday.
Car passenger Sandy Paul Waenga Brown, 21, from Paua, was the first person killed in the holiday period, in a crash near Cape Reinga about 2.30am on Christmas Day.
