Easter weekend is one of the biggest holiday weekends for the New Zealand Transport Agency.
The NZTA say the roads will busy anyway - but adding to the congestion will be people travelling to the three Ed Sheeran concerts in Dunedin and Warbirds over Wanaka.
NZTA Duty Manager Tresca Forrester is advising motorists to take their time this weekend, especially on Friday and Monday which are expected to be the busy periods.
Forrester says everyone will be on the road, so be aware of other users.
The road toll is already at 99 compared to 83 this time last year.
Many of the Ed Sheeran tickets have been bought by Christchurch concert goers so traffic between Christchurch and Dunedin is expected to be heavy.
The NZTA is recommending drivers need to "be patient", take care when over taking and allow extra time on the journey because the roads will be so busy.
The NZTA is also warning motorists travelling between Christchurch and Picton to expect delays. State Highway One reopened late last year but is still being closed overnight for safety reasons.
The Top Ten Holiday Park in Kaikoura is also busier than last Easter.
Co-owner Ed Nolan says there is an increase in bookings with many people coming from Christchurch.
Before the State Highway opened many people missed Kaikoura out as it was too difficult to reach and people couldn't get there.