I only have anecdotes and it’s from Chicago (not SF where indeed a lot of drivers commute an hour to get to a high demand area) but here it’s not that uncommon

I only have anecdotes and it’s from Chicago (not SF where indeed a lot of drivers commute an hour to get to a high demand area) but here it’s not that uncommon for people to be able to quickly hop on or off driving on short notice. It probably rarely moves the supply needle more than 10-15% at most but that’s not completely insignificant in comparing vs a less dynamic fleet like taxis.