Maybe in the boonies. Adding a carpool lane on 10 miles of the 405 cost 1.1 billion and construction was a shit show. Then we need to add sensors and whatever else into the road surface so private companies can get their profit margins? We can't even maintain our existing road surfaces. We have the lanes already, remove a car lane on every road over 1 lane wide and make it bus only; same grade separating benefits of a subway but requiring zero investment beyond retiming lights and buying plastic bollards and maybe a few more busses to pick up demand. The insurmountable difficulty is in not letting emotional NIMBYs kill the bill.

https://xtown.la/2019/05/02/the-sepulveda-passs-failing-grad...