Police will enforce a lower speeding threshold and breath-test every driver they pull over to try to prevent any road deaths over Queen's Birthday weekend.
Five people died during the Queen's Birthday holiday period last year.
However, no one died during the same period in 2013 and the national road policing manager, Superintendent Steve Greally, is hoping to repeat that result this year.
Mr Greally said officers would be issuing speeding tickets to anyone caught driving more than 4km/h over the limit.
He said they would also breath-test everyone they pulled over, regardless of the reason why they were stopped.
The official toll period this year began at 4pm and ends at 6am on Tuesday.