David Zipper January 30, 2026 2026, CityLab Congestion Pricing’s Unexpected Winners: Suburban Drivers David Zipper January 30, 2026 2026, CityLab Surprisingly, drivers’ time savings from NYC congestion pricing have overwhelmingly gone to those traveling outside Manhattan entirely.
David Zipper January 22, 2026 2026, CityLab Achieving ‘Transportation Abundance’ Is All About Density David Zipper January 22, 2026 2026, CityLab A surefire way to make transportation more affordable and abundant? Increase density.
David Zipper December 22, 2025 2025, CityLab When It Comes to US Transportation, 2025 Had Some Wins, Too David Zipper December 22, 2025 2025, CityLab Despite Washington’s headwinds, many cities and states made transportation safer, cleaner, and better this year
David Zipper December 5, 2025 2025, CityLab A Bright Idea for Road Safety: Traffic Light Timing David Zipper December 5, 2025 2025, CityLab The humble traffic light is a potent safety solution that’s hiding in plain sight
David Zipper November 19, 2025 2025, CityLab On the French Riviera, Street Reforms Come From the Right David Zipper November 19, 2025 2025, CityLab Can conservatives support restricting cars and boosting transit, walking, and, biking? The French Riviera offers lessons.
David Zipper October 17, 2025 2025, CityLab What Comes After the ‘War on Cars’? David Zipper October 17, 2025 2025, CityLab I spoke with the War on Cars podcasters about the past, present, and future of anti-car activism
David Zipper September 25, 2025 2025, CityLab A Showdown Over Speed and Safety, Italian-Style David Zipper September 25, 2025 2025, CityLab Bologna adopted a blanket 30 km/h speed limit. Italy’s right-wing government declared war.
David Zipper September 15, 2025 2025, Vox, Featured A self-driving car traffic jam is coming for US cities David Zipper September 15, 2025 2025, Vox, Featured A few ways cities can future-proof themselves for the self-driving era.
David Zipper September 4, 2025 2025, CityLab One-Way Streets Are the Wrong Way to Tame Downtown Traffic David Zipper September 4, 2025 2025, CityLab A simple way to improve American downtowns: Make one-way arterials bidirectional.
David Zipper August 28, 2025 2025, CityLab Automated Traffic Enforcement Is More Popular Than You Think David Zipper August 28, 2025 2025, CityLab Despite their controversial reputation, traffic cameras are both effective and popular.
David Zipper August 5, 2025 CityLab, 2025 All Hail the Humble Speed Hump David Zipper August 5, 2025 CityLab, 2025 Let us play homage to the speed hump, humble warrior in the battle against traffic chaos
David Zipper July 8, 2025 2025, Slate Zohran Mamdani has some good ideas for NYC transit. His Biggest Promise Isn't One of Them. David Zipper July 8, 2025 2025, Slate Buses shouldn’t be free.
David Zipper July 2, 2025 2025, CityLab What Gothenburg Got Out of Congestion Pricing David Zipper July 2, 2025 2025, CityLab Congestion pricing can only do so much if a city that doesn’t have much traffic to start with
David Zipper June 17, 2025 2025, CityLab How E-Scooters Conquered (Most of) Europe David Zipper June 17, 2025 2025, CityLab I spoke with Polis’ Karen Vancluysen about how e-scooters are changing European cities — for better and for worse
David Zipper April 16, 2025 2025, CityLab Why the Best Bike Lanes Always Get Blamed David Zipper April 16, 2025 2025, CityLab Cities must build bike networks — not just bike lanes
David Zipper March 14, 2025 2025, CityLab The Dark Prophet of Car-Clogged Cities David Zipper March 14, 2025 2025, CityLab 70 years ago, Lewis Mumford warned that urban highways would be a disaster. We should’ve listened.
David Zipper February 20, 2025 2025, CityLab Who Should Fix the Sidewalk? David Zipper February 20, 2025 2025, CityLab Denver recently became the first major US city to “nationalize” its sidewalks in order to build them faster.
David Zipper January 27, 2025 2025, Fast Company Trump is all-in on cars. It’s up to cities to stop him David Zipper January 27, 2025 2025, Fast Company Even without federal help, local government can encourage people to bike, walk, and ride transit
David Zipper January 23, 2025 2025, CityLab What Happened to Hanging Out on the Street? David Zipper January 23, 2025 2025, CityLab Rather than lingering, Americans are racing through streets quickly — and alone. That’s bad news for cities.
David Zipper January 6, 2025 Vox, 2025 Gigantic SUVs are a public health threat. Why don’t we treat them like one? David Zipper January 6, 2025 Vox, 2025 Like smoking a cigarette, driving a giant car endangers innocent bystanders. There is power in that narrative.
