Temporary traffic management in New Zealand runs on acronyms, and the list has grown while the ground has shifted from CoPTTM to NZGTTM. If you’re new to the work, or you’re a manager trying to follow what your planners are talking about, here’s a plain-English decoder for the terms you’ll actually meet on the job. Where a term has changed or is being retired, it’s flagged.
The framework
TTM — temporary traffic management. The whole discipline: keeping road users and workers safe around a temporary work site or event on or beside a road. Everything below sits under this.
NZGTTM — New Zealand Guide to Temporary Traffic Management. The current national guidance, published by NZTA in 2023. It puts risk assessment and planning first, and it replaced CoPTTM. This is what new plans are built to.
CoPTTM — Code of Practice for Temporary Traffic Management. The previous national standard, in place for more than 20 years. It was prescriptive, based on road category and speed. NZTA stopped updating it on 1 November 2024, and road controlling authorities are phasing it out on their own timelines, with several no longer accepting CoPTTM-based plans from 1 July 2026. Treat it as legacy.
HSWA — Health and Safety at Work Act 2015. The health-and-safety law that sits behind all of this, and the reason TTM moved to a risk-based model.
The plans and diagrams
TMP — traffic management plan. The full planning document for a job. Under NZGTTM it holds the risk assessment, the work details, and the site design, including one or more diagrams. It’s the whole plan, not a single form.
TMD — traffic management diagram. A New Zealand point worth getting right: here, TMD means a diagram. It’s the drawing that shows how the controls are laid out on the ground, and it sits inside the TMP. A plan often has several. (Overseas material sometimes uses TMD to mean a device. In NZ it’s the diagram.)
Generic vs site-specific TMP. A generic TMP uses pre-approved layouts from a library, picked with a clear method, and suits routine, low-risk work. A site-specific TMP is built for a job that falls outside those standard layouts. When the site has something the library didn’t plan for, you go site-specific.
PARS — pre-approved reusable schemes. On state highways, NZTA holds a set of pre-approved, reusable TTM layouts you can apply to qualifying sites without getting each one approved again. It’s the state highway side of the same idea as a generic plan: pick the right pre-approved scheme for the site instead of designing from scratch.
Permits and who approves
RCA — road controlling authority. Whoever is legally responsible for the road. That’s usually the local council for local roads, and NZTA for state highways. The RCA approves your plan, your corridor access and your temporary speed limits.
NZTA / Waka Kotahi — New Zealand Transport Agency. The agency responsible for state highways and for the national TTM guidance. It owns both CoPTTM and NZGTTM, and acts as the RCA on state highways.
CAR — corridor access request. The application you lodge before working in the road corridor. No CAR, no work.
WAP — works access permit. The permit you receive once a CAR is approved. You apply through the CAR; the WAP is what authorises you to start. They’re two ends of one process, not two separate applications.
Health and safety, and speed
PCBU — person conducting a business or undertaking. The health-and-safety term for the duty-holder, usually the contractor running the works. NZGTTM’s risk-based approach is framed around this duty.
TSL — temporary speed limit. A speed limit changed for the duration of the works. It needs RCA approval and the right signage, and under a risk-based approach you should be able to say why it’s there.
The people, and a change worth knowing
The roles are mid-change. NZTA’s old warrant system for people ended on 1 November 2024 and is being replaced by NZQA micro-credentials under the TTM credentials framework. You’ll still hear the old titles on site during the changeover.
STMS — site traffic management supervisor. The person responsible for managing and documenting TTM on site. The STMS warrant is being retired and moved onto the new credentials, but the role and title are still in everyday use.
TMO — traffic management operative. The frontline worker who sets out and maintains the controls. The TMO warrant is being replaced by the new skill standards too.
TC — traffic controller. The person manually controlling traffic, for example stop/go. Commonly holds a TC ticket.
TMC — traffic management coordinator. Coordinates TTM across a project or between sites and parties.
TTM Planner, and what replaces it. The old planner warrant is being replaced by the TTM Design micro-credential (Level 4). There’s also a new TTM Risk Assessment micro-credential (Level 4) built for the risk-based approach, plus a set of Level 3 credentials for frontline work. If someone mentions “TTM Design”, they mean the credential that replaced the planner warrant.
The layout language
You’ll see these when a diagram is described. Traffic meets the site in this order: an advance warning area where drivers are warned; a transition area, or taper, where traffic is moved sideways out of its normal path; a buffer or safety zone separating traffic from the workers; the work space itself; and a termination area where the road returns to normal. NZGTTM tightened the buffer requirements compared with the old code.
The mix-ups worth clearing up
A TMP is the whole plan; a TMD is just the diagram inside it. CoPTTM and NZGTTM aren’t two options you pick between: NZGTTM is the current, risk-based replacement, and CoPTTM is the legacy code that’s being retired. You lodge a CAR and receive a WAP, not two separate permits. And an STMS warrant isn’t the same as the new micro-credential the role is moving onto, even though people still say “STMS” for both.
Where the official guidance lives
- New Zealand Guide to Temporary Traffic Management (NZGTTM). NZTA’s official guidance, and the source of truth.
- Managing work site traffic: good practice guidelines. WorkSafe New Zealand.
- Temporary traffic management credentials framework. Waihanga Ara Rau, for the roles and micro-credentials.