Urban Transportation's Four Separate Challenges

At the Shared Use Mobility Summit in Chicago, Jarrett Walker cautioned the tech world to keep four key transportation problems in mind.

1 minute read

April 3, 2018, 5:00 AM PDT

By Philip Rojc @PhilipRojc


Jeff McMahon sums up transit expert Jarrett Walker's comments at the National Shared Mobility Summit held in March. "Walker argued that technology can solve some problems, but not the same problem that public transit solves." 

McMahon references a memorable Twitter spat between Walker and Elon Musk in which the Tesla founder criticized typical modes of transit and insulted Walker directly. At the summit, Walker called attention to "four separate problems of urban transportation which have four separate kinds of solutions," further arguing that "it is very important to not mistake the solution for one problem for the solution for a different problem."

The list includes 1) communications and real time information, for which digital tech has proven useful; 2) emissions and energy efficiency; 3) labor and safety; and 4) the amount of urban space different modes take up. 

Walker argued that "The fixed-route bus or train is the vehicle of the future [...] because it remains the most efficient way to move large numbers of people through the congested space of a city."

Monday, March 19, 2018 in Forbes

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Get top-rated, practical training

High-rise apartment buildings in Waikiki, Hawaii with steep green mountains in background.

Study: Maui’s Plan to Convert Vacation Rentals to Long-Term Housing Could Cause Nearly $1 Billion Economic Loss

The plan would reduce visitor accommodation by 25,% resulting in 1,900 jobs lost.

April 6, 2025 - Honolulu Civil Beat

Two yellow and white Dallas Area Rapid Transit light rail streetcars at station in Dallas, Texas.

North Texas Transit Leaders Tout Benefits of TOD for Growing Region

At a summit focused on transit-oriented development, policymakers discussed how North Texas’ expanded light rail system can serve as a tool for economic growth.

April 3, 2025 - KERA News

Blue and white Seattle Link light rail train exiting concrete Downtown Bellevue Tunnel in Bellevue, WA.

Why Should We Subsidize Public Transportation?

Many public transit agencies face financial stress due to rising costs, declining fare revenue, and declining subsidies. Transit advocates must provide a strong business case for increasing public transit funding.

April 7, 2025 - Todd Litman

Amtrak Acela

How to Make US Trains Faster

Changes to boarding platforms and a switch to electric trains could improve U.S. passenger rail service without the added cost of high-speed rail.

45 minutes ago - Bloomberg CityLab

Mural showing tools and craft supplies with banner reading 'Things are made here' in front of makerspace in Columbia, Missouri.

Columbia’s Revitalized ‘Loop’ Is a Hub for Local Entrepreneurs

A focus on small businesses is helping a commercial corridor in Columbia, Missouri thrive.

1 hour ago - Next City

Close-up of wood log with emerald ash borer larvae tracks etched in the wood.

Invasive Insect Threatens Minnesota’s Ash Forests

The Emerald Ash Borer is a rapidly spreading invasive pest threatening Minnesota’s ash trees, and homeowners are encouraged to plant diverse replacement species, avoid moving ash firewood, and monitor for signs of infestation.

2 hours ago - The Bemidji Pioneer