Traffic jams up on eastbound 91 freeway near Corona, California, Wednesday, Dec. 29, 2010. This photo was taken just days before California voted on new rules that would require automakers to build cars and trucks by 2025 that emit about three-quarters less smog-producing pollutants and also mandate that one of every seven new cars sold in the states be a zero-emission or plug-in hybrid vehicle. (AP Photo/Orange County Register, Bruce Chambers) The Trump administration is reportedly about to relax restrictions...