Safety rating bodies including NHTSA (U.S. government), IIHS (U.S. insurance-industry funded), Euro NCAP (Europe), and regional counterparts each use different test protocols, crash speeds, and scoring criteria, so a 5-star NHTSA rating and a 5-star Euro NCAP rating are not directly equivalent claims about a car's safety. True Motion Auto's policy is to always name the specific testing body behind any safety rating we cite and avoid cross-region comparisons unless a body publishes its own harmonization data.
At a glance: major safety rating bodies
| Body | Region | Notes |
|---|---|---|
| NHTSA | United States (government) | 5-Star Safety Ratings program; different protocol from IIHS |
| IIHS | United States (insurance-industry funded) | Known for stricter tests like the small-overlap frontal crash test |
| Euro NCAP | Europe | Own protocol and scoring; not directly comparable to NHTSA/IIHS star counts |
| ANCAP / other regional NCAPs | Australia, and adapted programs elsewhere | Broadly aligned methodology with Euro NCAP but locally administered |
Why star ratings aren't universal
It's tempting to treat a '5-star' safety rating as a single, portable fact about a car, but each testing body defines its own crash scenarios, speeds, dummy sizes, and scoring thresholds. NHTSA's 5-Star Safety Ratings program and IIHS's ratings, both American, use different test protocols and sometimes reach different conclusions about the same vehicle — a car can perform well on one body's tests and only adequately on the other's, without either being 'wrong.'
What differs between major bodies
NHTSA's program is run by the U.S. federal government and includes frontal, side, and rollover testing with its own scoring methodology. IIHS is funded by the insurance industry and is known for introducing tougher tests over time, such as the small-overlap frontal crash test, ahead of government programs. Euro NCAP operates independently in Europe with its own frontal, side, pedestrian-protection, and safety-assist scoring, weighted differently than either U.S. body. Regional programs modeled on Euro NCAP (such as ANCAP in Australia, or programs in other markets) generally follow a related but locally administered protocol.
- Always name the specific testing body behind any rating cited (NHTSA, IIHS, Euro NCAP, etc.)
- Do not present a rating from one body as equivalent to a star rating from another
- Note the model year tested, since safety ratings apply to a specific model year and can change with a redesign
- Check whether a vehicle was tested by more than one body and report both if so, rather than cherry-picking the higher rating
Why this matters for global or cross-market comparisons
A vehicle sold in multiple markets is often built with region-specific equipment and structural differences to meet different regulatory requirements, meaning the exact same nameplate can perform differently on safety tests conducted in different regions even beyond just the difference in test protocol. This is a genuine, evidence-based caveat for global comparisons, not just a technicality — equipment levels, structural reinforcement, and even engine/platform choices sometimes vary by market.
Our approach to cross-region safety comparisons
When comparing vehicles sold in different regions, we cite each vehicle's rating from the testing body relevant to its market, name that body explicitly, and avoid implying a direct numeric equivalence between differently sourced ratings. Where a body publishes explicit cross-comparison or harmonization guidance, we defer to that rather than making our own inference.
Model-year and redesign sensitivity
Safety ratings apply to a specific model year and, often, a specific structural generation of a vehicle. A rating earned by an older generation does not automatically carry over to a redesigned successor, even under the same nameplate. We check and cite the model year tested whenever referencing a safety rating.
If we cannot confirm which testing body and model year a cited safety rating came from, we either omit the rating or clearly flag it as unverified rather than presenting it as current fact.
Frequently asked questions
Is a 5-star NHTSA rating the same as a 5-star Euro NCAP rating?
Why do IIHS and NHTSA sometimes rate the same car differently?
Do safety ratings apply to every trim of a car?
Does a car sold in multiple countries get the same safety rating everywhere?
Do safety ratings expire or change over time?
Sources & further reading
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
