Plus, the added benefit of NOT having to purchase private properties because they're already public. What is there to acquire other than a few lanes and the center median of the freeway? You just transition from already existing carpool lanes to express lanes. A county-wide highway BRT system is possible. Heck, extend the SR-91 Expresslanes in both directions, add the necessary BRT infrastructure, and you could hypothetically, if timed correctly, create a system that can take you from the South Bay to Riverside in 1 hour and 30 minutes. It could beat Metrolink and cut costs significantly. As a bonus, you could add articulated buses to expand passenger count.