Building roads and changing physical structures will help. But, we need to change actual driving behavior. Starting with ALWAYS leaving room for someone to change lanes in front of you. Leaving space even when that jerk moves to the front of a long merge line. It seems counterintuitive, but always leaving space makes traffic move much faster. So, a public campaign? Always leave room and you will get there faster and safer. If people did this now, traffic would be much better.