Research Articles

What Blocks Bike Lanes

Explore the vehicles behind crowdsourced bike-lane obstruction reports. A photo-based breakdown with fleet counts and links to the original reports.

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Real barriers don't fold

A car can only block a bike lane it's able to enter—which means the same lanes get parked in and get people killed. Greater Boston's blocked-lane reports show why only real, physical separation fixes both.

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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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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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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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Do Bike Lanes Hurt Local Businesses? What Controlled Studies Actually Find

Controlled studies test how bike lanes affect local business sales, jobs, vacancies, customer visits, parking, and construction disruption.

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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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The Bike Lane That Was Supposed to Kill Saint-Denis Street

How Montreal's Saint-Denis REV changed cycling, winter travel, traffic, and local business—and what its data can really prove.

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