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How Car Safety Ratings Are Measured (NCAP, IIHS, etc.)


How Car Safety Ratings Are Measured (NCAP, IIHS, etc.)


When shopping for a new car, safety is often one of the first concerns for buyers. To help consumers make informed decisions, organizations like NCAP (New Car Assessment Program) and IIHS (Insurance Institute for Highway Safety) provide safety ratings. But how exactly are these ratings measured, and what do they really mean for drivers and passengers?



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1. Understanding NCAP


The New Car Assessment Program (NCAP) is a government initiative that tests vehicles in standardized crash scenarios. Different regions have their own NCAP programs, such as Euro NCAP, U.S. NCAP (NHTSA), and ASEAN NCAP.


Frontal crash tests simulate head-on collisions.


Side-impact tests measure protection when struck from the side.


Rollover resistance evaluates a vehicle’s likelihood of flipping.


Vehicles receive star ratings (1 to 5), with 5 stars being the safest.




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2. What IIHS Tests


The IIHS is a U.S.-based nonprofit funded by auto insurers. Unlike NCAP’s star ratings, IIHS assigns grades such as Good, Acceptable, Marginal, or Poor across various categories.


Key tests include:


Moderate and small overlap crashes to see how vehicles handle offset impacts.


Roof strength tests to evaluate rollover protection.


Head restraint and seat evaluations for whiplash prevention.


Pedestrian safety assessments, which have become increasingly important.




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3. New Factors in Modern Testing


Safety ratings are no longer only about how cars perform in crashes. Today, organizations also evaluate active safety technologies such as:


Automatic emergency braking (AEB)


Lane-keeping assist


Adaptive headlights


Crash prevention systems



These technologies are factored into overall safety scores because they help drivers avoid accidents in the first place.



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4. Why Ratings Differ


It’s common for the same car to receive slightly different scores from NCAP and IIHS. This happens because each organization uses unique testing methods and scoring systems. However, both aim to provide consumers with reliable information about real-world safety.

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