CoPTTM vs NZGTTM
The NZ traffic management industry is transitioning from prescriptive rules to risk-based planning.
CoPTTM acronym
Code of Practice for Temporary Traffic Management — Legacy prescriptive standard with fixed rules.
NZGTTM acronym
New Zealand Guide to Temporary Traffic Management — Current risk-based standard (introduced 2023).
Core Difference: Rules vs Risk
| Aspect | CoPTTM (Legacy) | NZGTTM (Current) |
|---|---|---|
| Approach | ”Cookbook” — fixed distances, counts | ”Lowest Total Risk” — justified controls |
| Logic | ”Because the book says so" | "Because this controls this specific risk” |
| Flexibility | Rigid; needs EED to deviate | High; encourages site-specific solutions |
| Key Document | TMD | Risk Register (mandatory) |
| Equipment | Standardized signs/cones | Toolbox approach (VMS, barriers, sequential lights) |
EED acronym
Engineering Exception Decision — Formal approval to deviate from CoPTTM standards.
Transition Timeline
| Date | Milestone |
|---|---|
| 2022-2023 | NZGTTM introduced |
| Late 2024 | Warrant cards discontinued |
| July 2026 | Hard deadline for many RCAs |
| 2026-2027 | Expected full transition |
Check Your RCA
Transition deadlines vary by region. Verify requirements with your Road Controlling Authority.
Lowest Total Risk
Under NZGTTM, consider whether controls create new risks:
- Driver frustration from excessive cones
- Dangerous merging situations
- Pedestrian confusion
Balance worker safety against road user impact.