Taxies in general. I know medallions already limit their numbers but if you've ever been locked in traffic surrounded by yellow cabs, count the passengers. Each one —mostly empty IME— is 120sqft of road. Cars trolling around for patrons is a bad system.
The Subway, buses, trams, etc, etc are all way better for passenger density.
Like airports already do, the city could provide rideshare "waiting area" parking lots in different zones. That would retain rapid response to on-demand pickup, without random trolling on city streets as defacto parking lots. Rideshare averages only 50% utilization of taxis, despite having the advantage of automated scheduling.
Instead the city added a per-ride fee, which will be covered by Uber/Lyft, making it useless as an incentive for ride reduction, https://archive.is/MtRgo
> Riding in a taxi, green cab or black car will now cost passengers an extra 75 cents in the congestion zone... The surcharge for an Uber or Lyft will be $1.50 per trip... cars for services like Uber and Lyft make fewer trips and are more likely to idle in the zone. In 2023, taxis made an average of 12 daily trips, while ride-hail vehicles made an average of six.
Do you think that's what the average American pays for their sandwich? Including bringing lunch from home.
If you don't understand working poverty, you won't understand how devastating only $3kpa really looks like on a low wage. Lot's of people right now can't afford that, so cost-neutral alternatives have to exist or you price people out.
