[Pedestrian]

Originally Posted by iamfishhead

Yeah. This. Exactly. I expect this platform will usually only see most of its traffic from one direction. A center platform allows for more effective use of space as opposed to having a platform half the size mostly empty and another platform half the size totally packed.

Indeed. It always helps to go to the source:

In anticipation of the new Golden State Warriors’ Chase Center and the growth in jobs, housing, healthcare and retail in the Mission Bay, the SFMTA is constructing a new center platform along 3rd Street between South and 16th streets. This new, larger platform will service both the inbound and outbound trains and greatly expand transit capacity in preparation for large crowds. The two existing platforms, which are split as separate inbound and outbound, will be demolished as part of the project. The greater size of the new and improved platform will enable four, two-car trains to load simultaneously during larger events. When needed, the platform will also allow for trains to depart inbound from both sides of the platform to connect customers quickly to BART, CalTrain and eventually the Central Subway.

https://www.sfmta.com/projects/ucsf-...atform-upgrade