U.S. institute does rollover tests for 12 midsize 4x4s
New test results show that some automakers are doing a good job of designing vehicle roofs that perform much better than current U.S. federal rollover standards require. But the roofs on some other vehicles need improvement. In the first U.S. Insurance Institute for Highway Safety (IIHS) roof strength tests of so-called midsize SUVs, six earn the top rating of ‘good’ for rollover protection, one is ‘acceptable’ and five others earn the second lowest rating of ‘marginal.’