Manufacturers are constantly making changes to their vehicles, but time and budget constraints make it impossible for the Institute to test every model every year. To keep our ratings as comprehensive as possible, Institute engineers work with manufacturers in a process known as test verification.

Every year, the Institute determines whether vehicles are changing in any way that could affect their performance in crash tests — for example, if modifications are being made to the structure or to airbags. Engineers gather information about upcoming models from trade journals, auto shows and other sources and confirm their assessment regarding each vehicle with the manufacturer. If there are no changes, the rating from the previous model year gets carried over. If a vehicle has been substantially redesigned, it must be tested again to be included in the ratings.

The Institute doesn't conduct all the tests for every redesigned vehicle itself. If the previous year's model was rated good in the side or moderate overlap frontal test, the manufacturer may conduct a verification test in that category. Only vehicles that were rated good are eligible for verification. If the vehicle was rated acceptable, marginal or poor, the Institute tests the new version.

How it works

If a vehicle is eligible for verification, and the manufacturer wants the new version to receive a rating from the Institute, the company must conduct the frontal offset or side crash test according to Institute parameters. The company provides video footage of the test, measurements of intrusion and injury data from the dummies. Institute engineers analyze this information and assign the rating, just as they would if the crash test had taken place in the Institute's own Vehicle Research Center.

Currently, the Institute allows verification tests only for moderate overlap frontal and side ratings. The small overlap frontal test is too new to include in the verification program. If a vehicle's seats or roof has changed at all, the Institute conducts a new head restraint or roof strength evaluation.

To ensure good faith participation, the Institute conducts occasional audit tests in which vehicles are retested in-house to make sure the results don't differ significantly from the manufacturers' tests.

Benefits

Verification allows the Institute to provide consumers with up-to-date information. It ensures that automakers continue to pay attention to frontal and side crash protection as they redesign vehicles. At the same time, it frees Institute engineers to conduct research and develop new tests that in the future will lead to even more improvements in crash protection.