David Zipper April 14, 2026 2026, CityLab Searching for the ‘Smoking Gun’ in US Pedestrian Deaths David Zipper April 14, 2026 2026, CityLab Why do so many Americans die while walking?
David Zipper March 10, 2026 2026, CityLab The US Is Counting Traffic Deaths Wrong David Zipper March 10, 2026 2026, CityLab Deaths per capita offers a complete picture of crash risk. Deaths per mile does not.
David Zipper February 23, 2026 2026, CityLab An Insurance Expert Appraises the Safety Record of Self-Driving Cars David Zipper February 23, 2026 2026, CityLab How safe are robotaxis, really? To find out, I spoke with a data guru at the Insurance Institute of Highway Safety.
David Zipper February 10, 2026 2026, CityLab The Best Tactics for Tackling Speeders David Zipper February 10, 2026 2026, CityLab The research is clear: Cities have plenty of ways to reliably curtail speeding. But implementation often feels like pulling teeth.
David Zipper January 6, 2026 2026, Financial Times Europe doesn't need driverless cars David Zipper January 6, 2026 2026, Financial Times What, exactly, do robotaxis offer European cities?
David Zipper January 6, 2026 CityLab, 2026, Featured We Still Don’t Know if Robotaxis Are Safer Than Human Drivers David Zipper January 6, 2026 CityLab, 2026, Featured Triumphant claims about AV safety are wildly overblown.
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 19, 2025 2025, Fast Company Tesla’s ‘Mad Max mode’ points to a big problem for self-driving cars David Zipper December 19, 2025 2025, Fast Company Cars are being programmed to break traffic laws. What could go wrong?
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 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 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 13, 2025 2025, CityLab The US-Canadian Road Safety Gap Is Getting Wider David Zipper August 13, 2025 2025, CityLab An American is 2.5x more likely to die in a crash than a Canadian, and the trendlines are diverging
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 10, 2025 2025, CityLab Why Did Cars Get So Hard to See Out Of? David Zipper July 10, 2025 2025, CityLab Posts known as A-pillars are creating dangerous blind spots
David Zipper June 3, 2025 2025, CityLab The Global Struggle to Build Safer Cars David Zipper June 3, 2025 2025, CityLab Cars around the world are growing safer — but not in the US.
David Zipper April 26, 2025 2025, Fast Company Virginia will use technology to slow chronic speeders’ cars—and other states are rushing to join in David Zipper April 26, 2025 2025, Fast Company This car safety tech has bipartisan appeal
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 February 11, 2025 2025, Fast Company This Google Maps ‘safety’ feature could actually make roads more dangerous David Zipper February 11, 2025 2025, Fast Company New features in Google Maps make the navigation app dangerously distracting — and users can’t turn them off
David Zipper November 21, 2024 2024, Fast Company Who’s really to blame—and who isn’t—for America’s traffic death epidemic David Zipper November 21, 2024 2024, Fast Company Saying that “road safety is a shared responsibility” is misleading and counterproductive.
