I was reading about this idea today. If all headlamps are fitted with a polarizing filter, then other drivers can almost completely eliminate glare by wearing glasses (or coating their windscreen) with another polarizing filter, perpendicular to the other.
The article I read noted that one major problem was that the polarization process would block 50% of the light output of a conventional incandescent lamp, meaning they wouldn't do their job as well; and it speculated that when lighting technology improved in future to include lighting devices that could emit polarizing light, then this idea might have its day again.
Is anyone producing such a thing commercially at the moment?