Structural foam, high-strength steel would absorb impact, create 'simple fix,' some say.
By Jeff Plungis and Bill Vlasic / The Detroit News
Here are some ways automakers could bolster vehicle roof strength:
* High-strength steel. Alloys can add strength without weight, but tend to be costlier.
* Structural foam. Cheap and well-known, keeps beams from bending.
* Automaker options
* Reinforced pillars. Makes them stronger during a crash.