The Bay Area provides a case study of the effect of transportation network companies on ground transportation to and from airports.

"In the past year, the number of trips by ride-booking services at the Oakland, San Jose and San Francisco airports has skyrocketed," according to an article by Erin Baldassari.
The growth of transportation network companies (TNCs) is obvious at Oakland International Airport: "Ride-booking consumed less than 2 percent of the total ground transportation market, excluding BART, in July last year but had 57 percent of the market by March…"
The growth of TNCs is also obvious at San Francisco International Airport, where their market share has increased from 9 percent to 58 percent between October 2014 and today.
One the flip side of the growth of TNCs, according to Baldassari, is contraction of the taxi business. At all three Bay Rea airports, taxi trips are down 23 percent—even as flights and passengers have increased.
The article details the legislative deals that allow TNCs to operate at each of the airports, as well as ongoing efforts to legislative a level playing field for the competing businesses.
FULL STORY: Taxis suffer as ride-sharing takes off at Bay Area airports

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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