Road Safety

Half of Boston's Blocked-Bike-Lane Reports Come From Nine Corridors

Nearly 1,000 crowdsourced reports of cars in Boston bike lanes cluster onto a handful of corridors. An optimization over the data identifies nine merged corridors that account for 508 reports—53% of the total—yielding a map of where to build protection first.

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Calgary Put a Bike-Lane Network on Trial—and Measured Everything

Calgary’s 18-month cycle-track pilot measured ridership, safety, winter use, traffic, demographics, and business impacts before going permanent.

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Twelve Loading Zones Could Cover Half of Cambridge's Blocked-Bike-Lane Reports

355 crowdsourced reports of cars in Cambridge bike lanes collapse onto a handful of curbs. An exact optimization finds the 12 smallest loading-zone locations—each a 200-meter circle—that together cover 51% of every report, and proves no eleven can do it.

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Floating Bus Stops: When a Protected Bike Lane Crosses the Bus Door

What floating bus-stop evidence says about bike safety, disability access, cyclist yielding, and England's pause on shared-use boarders.

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One-Way or Two-Way? How to Choose a Protected Bike Lane

One-way vs. two-way protected bike lanes: how intersections, access, width, signals, curb use, and maintenance should decide the design.

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Do Protected Bike Lanes Reduce Crash Risk? Count the Riders First

Do protected bike lanes reduce crash risk? London’s Cycle Superhighways show why cyclist exposure, design, and intersections change the answer.

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Reporting Cars in Bike Lanes: A History of Citizen Enforcement

How cyclists turned smartphones into an enforcement tool—from 311 and Bike Lane Uprising to Bike Bureau's open data and fast-growing Boston-area reporting network.

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Seville Built a Bike Network, Not a Collection of Bike Lanes

How Seville built a connected protected bike network fast, multiplied cycling, reduced risk per trip, and exposed the limits of lane mileage.

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