Summarize this aticle in few sentences highlighting those topics:

• Traffic started building up
• Because of Pandemic public transportation still was not a reliable option
  • Bart usage down 60%
  • SFMTA down 70%
  • Caltrain down 91%
• People relied on rideshare apps

Here is the reference:

TNC's Effect on Traffic in the Bay Area - 2021

https://www.sfpublicpress.org/bay-area-traffic-congestion-returns/