None of the motorcyclists was seriously injured.
Mr Cliff reminded drivers to be patient, get plenty of rest, keep speeds down and to refrain from drinking and driving.
"So far, all the messages seem to have been received because things seem to be pretty quiet out there.
"And the drink-drive message, which has been picking up at night time, that's been going quite well as well."
Police have also been enforcing the reduced holiday weekend 4km/h tolerance of speed limits.
"Crash data shows there's been a good solid reduction, since we started doing that, in the number of casualties. It seems to be well accepted," Mr Cliff said.
Last year, as well as the seven fatalities, there were 17 serious crashes and 59 minor crashes over Queen's Birthday weekend.
The official road toll period runs until 6am tomorrow.