Iihs Roof Strength Test
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Iihs roof strength test. This rating only applies to the specific seat head restraint combination tested indicated on the. The head restraints seats rating is based on a sled test of the vehicle s seat and head restraint. Roof strength test protocol version iii supporting documents for the insurance institute for highway safety iihs roof strength program are available from the technical protocols section of the iihs website. In order to earn a good rating a vehicle s roof must withstand a.
The force applied relative to the vehicle s weight is known as the strength to weight ratio. Roof strength test overview. In the test the strength of the roof is determined by pushing an angled metal plate down on one side of the roof at a slow but constant speed and measuring the force required to crush the roof.