City of Cambridge Reports Better Bike Lanes Led to Surge In Bike Traffic

The city has recorded a 250 percent increase in bike traffic since 2004.

8:58 AM EDT on March 10, 2026

A City of Cambridge traffic analysis finds "that investing in high-comfort bikeways is helping more people than ever choose to bike in Cambridge" with a 250 percent increase in citywide bicycle traffic since 2004.

Last month, the City of Cambridge published its biennial Biking in Cambridge Data Report, which compiles the city's bike traffic counts from 16 intersections across the city in addition to other data, like Census surveys and Bluebikes usage.

A combined bar/line chart showing growth in Cambridge bike traffic. The x axis shows years, from 2004 to 2024, and the y-axis from 0 to 30,000 shows total bike counts for each year, ranging from 6,045 in 2004 to 21,177 (a 250% increase) in 2024. — Bicyclists counted by the Citywide Bicycle Count Program during morning and evening commutes, 2004 to 2024. Between 2016 and 2022, counts were conducted every three years, so there is additional space to represent the gaps in data. Courtesy of the City of Cambridge.

Cambridge has been conducting bike traffic counts at these same 16 locations since 2004, the same year the city built its very first physically-separated bicycle lanes on Vassar Street as part of an MIT construction project.

The city conducts those counts on September weekdays during a two-hour period during the typical morning and evening commuting hours (7:30 to 9:30 a.m. and 4:30 to 6:30 p.m.), and the raw data is published on the city's data portal.

In addition to the citywide growth trend, the counts have revealed even higher growth in bike traffic in intersections where Cambridge has upgraded bike infrastructure.

Many of the places where Cambridge has installed new physically-separated bikeways since 2020 – Massachusetts Avenue, Inman Square, and along Garden and Brattle Streets – are also places where the city has witnessed the most growth in bike traffic:

A map of Cambridge showing bike infrastructure (colored lines) and yellow dots that indicate bike traffic count volumes. The biggest yellow dots are located along Mass. Ave. and Hampshire Street where there are protected bike lanes. — Cambridge Citywide Bicycle Count Program locations overlaid on a map of the city's bike network. Yellow circles indicate count locations, with circle sizes proportional to the number of people counted at each location. The lighter-shaded interior circle indicating 2004 traffic volumes and darker-shaded exterior circles indicating 2024 volumes. Courtesy of the City of Cambridge.

The city's report notes especially strong growth in the number of kids riding their bikes in the city. In the decade since 2014, the number of children recorded in the city's biennial counts has more than tripled.

In Inman Square, where the city completed new protected bike lanes and safer crosswalks in 2023, the city recorded an almost eight-fold increase in the number of kids on bikes.

Other findings from this year's data:

The number of reported bike crashes is on a downward trend, even though more people are biking. The rate of bike crashes per million bike miles travelled in Cambridge has declined from around 20 in the early 2000s to about 12 in 2024.
Fewer people are riding bikes on sidewalks: in 2004, about 15 percent of people counted were riding their bikes on sidewalks; in 2024, only 5 percent were. The biggest decreases were on streets with new separated bikeways: between 2022 and 2024, a count site at the Concord Ave./Garden Street intersection saw sidewalk riding decline from 7 percent to just 2 percent.
The rate of increase in counted bike traffic (250 percent since 2004) considerably exceeds the city's rate of expansion in physically separated bikeway mileage (which grew by 110 percent in the same period).

Read the full data report here: Biking in Cambridge Data Report 2025