Half of the amount would go to the BART extension, which would make a U-turn from downtown San Jose to the Santa Clara Caltrain station. Evidently, the freeway supporters are willing to roll the dice on that one. Transit Modes Akos Szoboszlay BART vs. commuter rail, PRT vs. LRT, LRT vs. buses. Over the years, I've heard countless arguments on which is better. So, let's make some back of envelope calculations.
Travel time is the primary criteria in travel mode choice.
So, let's compare the average speed of transit. The clock runs from the time you get on to the time you get off. Further factors from the customer's viewpoint are waiting time, travel time to stations, comfort and ticket price. PRT can be faster. It depends on the speed vs. price tradeoff.