^^ Expand Rail and maintain but limit the expansion of the freeway system (with the exception of the 710 underneath Alhambra/So.Pas).
We should not be focusing on an inefficient transit means such as roadways because it has a much, much lower capacity to mitigate the large amounts of people who all need to get to places.
Rail (esp. grade-separated) has the kind of capacity to move people around in a more efficient and consistent standard. If you can fit 600 people into a train coming into a station, the train will still zoom away at the same speed almost each and every time. Unlike the roadways...Sure, if there is no one on the road, you could technically go as fast as your car could drive, but will that be the case in 2050 with the millions added to our region? That's a scary thought.
Plus, there are intangible qualitative benefits to rail that is much harder (if not impossible) to reproduce in a system like LA's that relies almost solely on automobiles and parking. Certain areas are actually quite nice like Old Town Pasadena and Downtown Santa Monica, but they are only pocket areas with insubstantial size. If LA wants to be among the ranks of Tokyo and New York and London, well, it better have the subways (and actually used by lotsa people) to create the kind of energy that is immeasurable.
I have realized that LA's only chance of becoming GREAT is with that expanded subway system. Because we can have as many superlatives to this city as you want. The biggest of this, the most of that, the busiest of this, the tallest whatever. But it's about the day-to-day quality of life issues that it truly all boils down to. Sitting on the 405 after work on a Friday evening stuck in traffic instead of walking briskly past street-lined cafes and stores with PEOPLE walking with you will always prevent LA from being great.
So instead of FOCUSING on roadways (it is imperative to maintain our current roadways, don't get me wrong), we now urgently need to switch gears and start focusing on transit-alternatives that have proven their effectiveness in many other cities around the world.
What do we want for the future of LA? A city dominated by streets like this:
Or this?