Essentially, Uber and Lyft chose a tax on rides instead of a gross-receipts tax.

"San Francisco lawmakers want to tax Uber and Lyft rides, and both companies say that’s OK with them," reports Carolyn Said.
"The proposed tax, which applies only to trips that originate in San Francisco, would levy a 3.25 percent tax on net rider fares for single-party trips and 1.5 percent on shared rides," according to Said.
The San Francisco County Transportation Authority will be responsible for spending the $30 million in expected revenue generated by the new tax on transit projects, if the State Legislature grants San Francisco powers to tax ride-hailing trips.
The ride tax eliminates the need for a ballot initiative planned for November "that would have asked voters to tax ride-hailing companies’ gross receipts at rates up to 0.975 percent." Rachel Swan reported in more detail on that proposal by Supervisor Aaron Peskin in April 2018.
The potential for a political fight over the gross-receipts tax paved the way for the new tax on rides, according to Said.
FULL STORY: In compromise with SF Supervisor Peskin, Uber and Lyft agree to new ride tax

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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research