In NSW, councils typically require a full Transport Impact Assessment (TIA) when a proposal is large enough or located such that it may affect network safety or efficiency—especially where referral to Transport for NSW is triggered—while a lighter Transport Impact Statement (TIS) or parking assessment may suffice for lower-impact sites. Parking rates remain council LEP/DCP-specific; always check the applicable controls rather than assuming statewide numbers.
What is a TIA vs a traffic statement vs a parking assessment?
Transport for NSW’s current technical guidance is the Guide to Transport Impact Assessment (GTIA), Standards ID TS 00085, Version 1.1. It superseded the long-standing Guide to Traffic Generating Developments (GTGD 2002) and the Updated Traffic Surveys Technical Direction (TDT 2013/04a) from 4 November 2024. The GTIA applies to TIAs commenced and development applications lodged on or after that date. Practitioners should cite the Guide version used in the report introduction so reviewers can assess against the same edition.
Under the GTIA:
- Transport Impact Assessment (TIA) — an objective appraisal of how a development affects surrounding transport networks across modes (walking, cycling, public transport, general traffic, freight and servicing). It quantifies trip generation and mode share, assesses safety and operational impacts, and recommends mitigation (including travel demand management where relevant).
- Transport Impact Statement (TIS) — a lighter assessment for proposals expected to have relatively low trip generation and limited network impact. It still covers site context, scale, access, trip generation/distribution, nearby intersections and safety observations, but is not as comprehensive as a TIA. Confirm methodology with the consent authority before relying on a TIS.
- Parking assessment — analysis of supply and design against the applicable Local Environmental Plan (LEP), Development Control Plan (DCP) and any SEPP parking provisions for the land use and locality. Parking rates are not a single statewide schedule; they are council- and instrument-specific. The GTIA’s Chapter 8 provides parking provision and design guidance and reference rates, but local EPIs and DCPs prevail where inconsistent.
In practice, councils often receive a traffic/parking report as an annexure to the Statement of Environmental Effects (SEE), or as a standalone specialist report cross-referenced in the SEE.
When do NSW councils typically require a full TIA?
There is no single “every DA needs a TIA” rule in the Environmental Planning and Assessment Act 1979. Transport and parking are matters councils assess under the Part 4 consent framework, informed by EPIs, DCPs and referral triggers. The GTIA states that a minor development (for example a new house that meets applicable standards) may not require a TIA, while developments that affect transport network operations may.
A TIA is commonly expected where:
- The proposal meets traffic-generating development thresholds in Schedule 3 of State Environmental Planning Policy (Transport and Infrastructure) 2021, triggering consultation with TfNSW under section 2.122 (and related provisions such as section 2.97 where applicable).
- Site access is to a classified road, or within about 90 metres of a connection to a classified road (Schedule 3 Column 3 thresholds are typically stricter for those locations—always check the current Schedule on legislation.nsw.gov.au).
- Existing conditions are complex (constrained streets, crash history, geometric minima, peak recreational flows, high heavy-vehicle share, or cumulative nearby approvals).
- Council’s DA checklist or pre-lodgement advice expressly requires a TIA or TIS.
The Department of Planning’s Development referrals guide notes that for traffic-generating development or complex existing conditions a TIA (including road safety assessment) prepared with reference to current TfNSW guidance is expected; a basic Traffic Impact Statement may be acceptable where existing conditions are compliant and unconstrained and proposed travel demand sits below Schedule 3 size/capacity thresholds.
Do not invent Schedule 3 numeric rates in your SEE. Measure access geometry carefully—the 90-metre rule runs along the connecting road alignment, so a site that “feels” set back from a main road can still be captured.
Common triggers for traffic and parking reports
Designers and planners should flag traffic/parking early when any of the following apply:
| Trigger type | Why councils care | Typical report depth |
|---|---|---|
| Higher trip generation (multi-dwelling, mixed use, retail, education, medical) | Peak-hour loading on local streets and intersections | Often TIA; confirm Schedule 3 / council checklist |
| Dual occupancy / multi-dwelling on constrained streets | Driveway conflicts, visitor parking overflow, waste/service access | TIS or parking + access assessment; escalate if complex |
| Change of use with different peak patterns | Existing parking supply may no longer match demand profile | Parking assessment ± TIS |
| Schools / child care / places of assembly | Pick-up/drop-off peaks, pedestrian safety, bus/coach access | Often TIA; education-related SEPP referral may also apply |
| Access near classified roads / signals / rail | Safety, efficiency, TfNSW/Sydney Trains interests | TIA; Roads Act / corridor referrals may apply separately |
| Basement parking, loading docks, waste rooms | Swept path, queue queues, AS design, sightlines | Design drawings + parking/access chapter in TIA/TIS |
Related packages often travel with the same DA: acoustic, contamination, arborist, and dilapidation where basement excavation sits near neighbours.
What councils and TfNSW expect in the report
The GTIA’s methodology (Chapter 3) adapts Austroads Guide to Traffic Management Part 12: Integrated Transport Assessments for Developments to NSW. Core content typically includes:
- Development description — land use, scale, staging, completion/operation years, multimodal access points.
- Strategic and statutory context — LEP/DCP, relevant SEPPs, Movement and Place considerations, and consistency with State/local transport strategies where relevant.
- Existing and future baseline networks — roads/intersections, public transport, walking and cycling, parking (on- and off-street), safety performance, committed upgrades, and the defined area of influence.
- Trip generation, mode share, distribution and assignment — with documented assumptions; GTIA Chapter 5 covers land-use trip generation principles and survey-based rates.
- Travel demand management (TDM) — hard and soft measures and, where required, a Travel Plan (GTIA Chapter 4).
- Network impact assessment — capacity/performance and safety across modes; mitigation proposals that are practical and fundable.
- Parking provision and design — car, accessible, motorcycle, bicycle/micromobility and end-of-trip, plus freight/servicing and loading (GTIA Chapter 8). Compare supply to the applicable LEP/DCP rates for that LGA—do not paste “generic” rates.
- Site access and internal layout — sightlines, swept paths, pedestrian/cyclist priority, service vehicle routes, waste collection (GTIA Chapter 7).
- Construction traffic — a Construction Traffic/Transport Management Plan (CTMP) may be conditioned separately; large projects benefit from early construction consideration in the TIA (GTIA section 3.4.4).
Where works interface with State roads or traffic signals, note TfNSW’s Strategic design requirements for DAs and any Roads Act s 138 pathway—these sit alongside planning consent, not instead of it.
How designers and planners coordinate drawings + SEE with the traffic engineer
Traffic reports fail when architecture, SEE narrative and engineering numbers tell three different stories. Coordinate early:
- Architect / designer — freeze driveway locations, ramp grades, aisle widths, parking bay counts (including accessible), loading dock geometry, waste room access, pedestrian entries and bicycle parking in the DA drawings and RL sections.
- Town planner — map LEP/DCP parking rates and any Schedule 3 / referral triggers; frame impacts and mitigation in the SEE; avoid inventing rates or GFA figures that conflict with plans.
- Traffic engineer — confirm TIA vs TIS scope with council/TfNSW where needed; run trip gen and swept paths against the frozen layout; document version of GTIA used.
When parking supply sits below a DCP rate, the SEE and TIA must present a coherent justification (accessibility, mode share evidence, car-share, TDM)—not a silent shortfall. giantA’s architectural, drafting and BASIX/NatHERS services across Greater NSW routinely coordinate these interfaces so drawings, SEE and specialist reports align before Planning Portal lodgement.
CDC vs DA: parking and traffic implications (high-level)
Pathway choice matters. Complying development is not a free pass on traffic:
- Under the Environmental Planning and Assessment Regulation 2021 section 128, certain traffic-generating complying development applications must be accompanied by a certificate from the relevant roads authority stating that network impacts are acceptable (or will be if stated requirements are met). That includes, among other categories listed in s 128, car parks of 50 or more spaces and specified Part 5A commercial/industrial complying development types (including some with 50+ vehicles per hour thresholds). Always read the current regulation text.
- Ordinary DAs remain the pathway where Schedule 3 referral, complex access, or council discretion requires a TIA/TIS and full merit assessment.
- Exempt development that genuinely meets code standards typically does not attract a TIA—but borderline “is this still exempt?” cases should be checked carefully; see Exempt vs CDC vs DA NSW 2026.
If you are unsure whether CDC still fits once access, parking or roads-authority certification is considered, resolve pathway before paying for the wrong report package.
How to avoid RFIs on traffic and parking
- Confirm TIA vs TIS in writing with the consent authority (and TfNSW for referral-scale proposals) before spending on modelling.
- Cite GTIA TS 00085 v1.1 (or the exact version used) and align methodology with Chapters 3–8 rather than relying solely on superseded GTGD language.
- Use current Schedule 3 thresholds from the Transport and Infrastructure SEPP—do not copy outdated GTGD trigger tables into the SEE.
- Match parking counts on plans, SEE and the traffic report to the same GFA/dwelling definitions used in the LEP/DCP rate table for that council.
- Show swept paths for the design vehicle (waste, removalist, fire, loading) that the DCP or council checklist expects.
- Document sightlines and gradients at driveways; RFIs often target unsafe reverse manoeuvres onto classified or collector roads.
- Address construction staging where excavation, crane or haulage will close footpaths or occupy kerbside—do not leave CTMP as an afterthought if the site is tight.
- Keep multimodal honesty — the GTIA expects walking, cycling and public transport to be assessed, not only vehicle Level of Service.
Process overview: from concept to lodgement
- Check pathway (Exempt / CDC / DA) and any Schedule 3 or roads-authority triggers.
- Read LEP parking clause + DCP traffic/parking chapters for the LGA.
- Agree TIA vs TIS scope; engage traffic engineer early if basement or classified-road access is likely.
- Freeze access and parking layout in architectural plans.
- Prepare TIA/TIS + parking assessment; cross-reference in the SEE.
- Lodge via the NSW Planning Portal with council checklist complete.
- Respond to TfNSW/council referrals with tracked revisions if access geometry changes.
Frequently asked questions
Is a TIA mandatory for every NSW DA?
No. The GTIA indicates minor developments that meet applicable standards may not need a TIA. Councils require assessment proportional to impact, and Schedule 3 / referral triggers make a TIA far more likely for larger or strategically located proposals.
What replaced the Guide to Traffic Generating Developments?
TfNSW’s Guide to Transport Impact Assessment (TS 00085 v1.1). It superseded GTGD 2002 and TDT 2013/04a from 4 November 2024 for TIAs commenced and DAs lodged on or after that date.
When is a Transport Impact Statement enough?
When trip generation and network impact are expected to be relatively low, existing conditions are compliant/unconstrained, and demand sits below Schedule 3 thresholds—subject to consent authority confirmation. Complex safety or access issues can still force a full TIA.
Where do I find parking rates?
In the applicable LEP and DCP for the local government area (and any SEPP that applies to the land use). The GTIA discusses parking principles and reference rates, but does not replace local EPI/DCP controls. Never invent a statewide rate table.
What is Schedule 3 of the Transport and Infrastructure SEPP?
It lists traffic-generating development types and size/capacity thresholds. Column 2 generally applies to sites with access to a road; Column 3 applies stricter thresholds where access is to a classified road or to a road connecting to a classified road within 90 metres of that connection. Section 2.122 requires councils to consult TfNSW for those developments.
How does CDC traffic certification differ from a DA TIA?
EP&A Regulation 2021 s 128 requires a roads-authority certificate for specified traffic-generating complying development. That is a certification pathway for CDC, not a substitute for DA merit assessment or Schedule 3 referral on a DA.
Should construction traffic be in the TIA?
A CTMP is often conditioned separately; the GTIA still encourages early construction consideration on constrained sites, and large proposals may include a preliminary CTMP with the TIA.
Key takeaways for 2026 NSW projects
For NSW DAs in 2026, treat traffic and parking as a scoped, multimodal evidence package—not a boilerplate appendix. Use TfNSW’s GTIA (TS 00085 v1.1) as the methodological baseline, confirm whether Schedule 3 referral applies, match parking to the correct LEP/DCP rates, and keep drawings, SEE and the engineer’s numbers identical. Choose TIA vs TIS deliberately; escalate when access geometry, classified roads or complex peaks demand it.
For coordinated architectural documentation and approval support across Greater NSW—from Parramatta CBD outwards—visit giantA services.
Sources
- Transport for NSW, Guide to Transport Impact Assessment (TS 00085, Version 1.1) — commenced 4 November 2024; supersedes GTGD 2002 and TDT 2013/04a. Print PDF: transport.nsw.gov.au. Consultation/overview: haveyoursay.nsw.gov.au.
- State Environmental Planning Policy (Transport and Infrastructure) 2021 — section 2.122 and Schedule 3 (traffic-generating development). Current text: legislation.nsw.gov.au.
- NSW Department of Planning, Housing and Infrastructure, Development referrals guide — TfNSW traffic-generating referral expectations (TIA vs basic statement). planning.nsw.gov.au PDF.
- Environmental Planning and Assessment Act 1979 (NSW) — Part 4 development consent; development standards include traffic generation and parking facilities (see Act definitions).
- Environmental Planning and Assessment Regulation 2021 (NSW) — section 128 (traffic generating complying development).
- NSW Planning, Stage 2 – Lodging your development application — specialist reports and portal lodgement. planning.nsw.gov.au.
- Transport for NSW — private development / documents for third-party works (strategic design requirements; historical GTGD still listed for reference). transport.nsw.gov.au.
- Austroads, Guide to Traffic Management Part 12: Integrated Transport Assessments for Developments — national guidance referenced by the GTIA (cite current Austroads edition when used in a report).