The Waikato is taking a "wait and see" approach as motorists brace themselves for the change to the 35-year-old left-turning traffic rule.
Auckland Council this week announced plans to make changes to about 500 of the city's 15,000 intersections before the reversal of the right-hand turning rule on March 25 - while Hamilton City Council is going to see what happens before taking any action.
Under the new rule, vehicles turning right at intersections will have to give way to those turning left.
The council has surveyed the city's 60 signalled intersections and hundreds of non-signalled intersections and has decided to monitor the impact before making changes. About 20 intersections that are not signalled have been identified as being problematic if right-hand turning cars are backed up in the middle of a road while they wait.
A similar approach is being taken by the New Zealand Transport Agency's (NZTA) at the intersections of the Waikato and Bay of Plenty state highways.