I think 1) the roads need to be engineered better and 2) speed limits should be dynamically controlled based on the flow of traffic. All the speed limit signs should state a minimum speed and a maximum speed in big Led letters that can adjust throughout the day based on flow. The Bay Area has done a lot of good stuff with the metering lights to control flow, and induction sensors all throughout the highway to monitor flow, but the next step is to is to adjust the traffic speed based on this. Then the problems will start to go away...