Bike Bureau

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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Two Streets Hold 70% of Brookline's Blocked-Bike-Lane Reports

555 crowdsourced reports of cars in Brookline bike lanes land almost entirely on two streets: Harvard St and Beacon St hold 70% of them. A map of where protected lanes would do the most good.

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After Flex Posts Went In at Coolidge Corner, Blocked-Lane Reports Fell by Two-Thirds

Brookline added flex posts at Coolidge Corner the week of August 17, 2026. One regular rider's blocked-lane reports there fell from 4.8 to 1.6 a week, while their reports elsewhere held steady.

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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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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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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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Visualizing Bike-Lane Obstructions

A visual record of Bike Bureau obstruction reports, from an interactive timestamped map to citywide accumulation, a traffic snake, and block-level hotspot reconstructions.

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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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What if buses reported every blocked bike lane?

74% of Bike Bureau obstruction reports in Greater Boston fall along an MBTA bus route, plus a map of the 36 shared bus/bike lane corridors blocked most often.

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