Any person planning to undertake work that will affect the condition of a road, its use, or access to a road must request permission from ICI for a Corridor Access Request (CAR).
The kind of work that this covers is connecting accessways (driveways) to public roads, installing underground facilities outside the pavement area, and things like installing business signs within the road corridor. In any case, it is best to contact ICI to check on whether you need permission or not.
Fill the online form out here, call 20321 or email infrastructure@cookislands.gov.ck to obtain a form and/or find out what permission you need.
Infrastructure managers will likely know whether their work will affect the movement of traffic. If you are aware, fill out and attach a Traffic Management Plan application form with your Corridor Access Request application.