News Release: November 25, 2019

Could Pooled Ride-Sharing Improve Sustainability?

CHICAGO (November 25, 2019) — Could pooled ride-sharing and autonomous vehicle technology improve sustainability? Probably. But the key finding of new research is that sustainability benefits come not from the technology that allows cars to drive themselves, but from the fact that passengers are using a service to share the ride.

Assistant professor Louis Merlin explores that potential in his Planning Viewpoint, "Transportation Sustainability Follows from More People in Fewer Vehicles, Not Necessarily Automation" in the Journal of the American Planning Association (Vol. 85, No. 4). Merlin reminds readers that shifting to sustainable transportation is not a distant dream but rather a present reality with centralized fleet coordination technology and pooled rides.

Merlin’s definition of “pooled-ride services” includes traditional modes such as carpooling and vanpooling, and modern ride-hailing services such as Uber Pool and Lyft Shared that use centralized fleet coordination to group together riders traveling to and from nearby locations. Drawing from several studies, Merlin highlights the multiple benefits of increased use of pooled-ride services. With more people in fewer vehicles with a coordinated route to their destinations, pooled-ride services can:

  • Reduce congestion by minimizing the total number of vehicles on the road
  • Eliminate “deadheading,” or vehicle miles of travel an automobile spends looking for a passenger
  • Reduce travel costs
  • Reduce environmental impact
  • Supplement existing public transit systems in a “first mile/last mile” model
  • Provide more equitable access to sustainable transportation as riders share the cost of the trip

Currently, fewer than 10 percent of transportation network company trips are pooled, indicating an opportunity to increase the use of pooled rides.

In addition to supporting more comprehensive research of ride-sharing services, planners can help by advocating for transportation policies that encourage the growth of pooled-ride services. Examples include policies to accommodate parking pricing, congestion pricing, VMT fees, and other forms of user-pay financing. This is also an opportunity for planners to reorganize the structures that govern transportation with an eye toward broader goals of expanding equity and reducing environmental impact.

In recent years, the potential of automated vehicles has been at the center of discussions about the technological advancement of transportation. While major breakthroughs in the development of self-driving cars are exciting, Merlin asserts that improving sustainability of shared rides does not require self-driving vehicles, but rather a focus on the technology we have today.

Planning Viewpoints are a new article format in the Journal of the American Planning Association focused on well-reasoned arguments that draw on planning scholarship and research relevant to planning practice. Planning Viewpoints are an opportunity to engage with issues of concern to the profession both in the U.S. and around the world.

The quarterly Journal of the American Planning Association publishes only double-blind peer-reviewed original research and analysis. The journal has published research, commentaries, and book reviews since 1935.

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Roberta Rewers, APA Communications Manager, 312-786-6395;

November 25, 2019