https://www.kpbs.org/news/politics/2021/05/28/sandag-transit-plan-high-speed-rail-housing

The plan envisions a massive boost in public transit in the coming decades, with faster and more frequent bus and trolley services and roughly 200 miles of new high-speed commuter rail. Gaps in the transit network would be filled by a "flexible fleet" of shared bikes, scooters and on-demand shuttles.

But the transit expansion's success depends on cities across the region dropping their long-held opposition to high-density housing. Mayor Todd Gloria said the new transit service should make it easier for communities to accept that transition from low-density suburbs to more compact, walkable neighborhoods.

Four cities — Coronado, Solana Beach, Imperial Beach and Lemon Grove — are currently suing SANDAG to lower the number of new homes they're required to plan for over the next decade. All those cities saw big jumps in their housing mandates due to changes in state law

In stark contrast to previous plans from SANDAG, this one does not include traditional freeway widenings. Some highways would see added capacity, however, by converting existing lanes and shoulders into carpool and toll lanes that would get more expensive during rush hour.