New Zealand Law
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District councils can be involved in setting speed limits, but the enforcement of speed is an issue for the police. The New Zealand Transport Agency has some jurisdiction over speed limits on state highways and general policy development over speed limits. So if it is the speed limit which is the problem, and you want the limits reduced on particular roads, your local council can change this on the roads in the jurisdiction, but any state highways should be a matter for the New Zealand Transport Agency. If the speed limits are not a problem, but it is people exceeding those limits, then it would need to be the police, and I would suggest start with your local police.
If you want specific contact details for any of these agencies please let me know