Increasing the ridership ''throughput'' can only be achieved by increasing the ''frequency'' of trains.  There are tremendous challenges associated with engineering shorter intervals since transbay timing issues can create a "BART traffic jam" within its own system. Discussion has begun to replace the system control mechanism and have enough trains to reduce the interval to 12 minutes, increasing throughput by up to 30%.

Increasing the ridership ''throughput'' can only be achieved by increasing the ''frequency'' of trains.  There are tremendous challenges associated with engineering shorter intervals since transbay timing issues can create a "BART traffic jam" within its own system. Discussion has begun to replace the system control mechanism and have enough trains to reduce the interval to 12 minutes, increasing throughput by up to 30%.

As of September 2016, BART expected the 12 minute interval would be achieved in 2023.  In July 2018, that estimate was moved back three years to 2026.

As of September 2016, BART expected the 12 minute interval would be achieved in 2023.