The high mode share of bikers in Boulder, Colorado allowed researchers to verify findings already documented by researchers in Europe.
"A University of Colorado Denver study examining collisions between bicycles and motorists, shows bicyclist safety significantly increases when there are more bikes on the road, a finding that could be attributed to a 'safety in numbers effect,'" according to an article on PhysOrg.
"The researchers wanted to create safety performance functions (SPFs) for bicycles in Boulder. SPFs model the mathematical relationship between the frequency of crashes and major factors related to them. Yet while there are SPFs for vehicles, there are none for bikes."
"The authors created their SPF for Boulder by studying crashes at intersections throughout the city where more than two-thirds of collisions occur. They compared the crash data to bicycle count data."
FULL STORY: Study shows more bicyclists on road means fewer collisions
Sharrows Are Ineffective, Potentially Counterproductive
Research shows there’s no substitute for protected bike lanes, and sharrows may make roads more dangerous for cyclists.
Austin Outlaws Blocking Bike Lanes
Drivers who park in bike lanes will receive citations of up to $300.
How San Francisco’s ‘People Protected Bike Lanes’ are Moving the Needle on Road Safety
A local bike safety protest has become a global phenomenon.
What ‘The Brutalist’ Teaches Us About Modern Cities
How architecture and urban landscapes reflect the trauma and dysfunction of the post-war experience.
USDOT Revokes Approval for NYC Congestion Pricing
Despite the administration’s stated concern for the “working class,” 85 percent of Manhattan commuters use public transit to enter the city.
Tiny House Villages for Addressing Homelessness: An Interview with Yetimoni Kpeebi
One researcher's perspective on the potential of tiny homes and owner-built housing as one tool to fight the housing crisis.
Preserving Altadena’s Trees: A Community Effort to Save a Fire-Damaged Landscape
In the wake of the Eaton Fire, Altadena Green is working to preserve fire-damaged but recoverable trees, advocating for better assessment processes, educating homeowners, and protecting the community’s urban canopy from unnecessary removal.
The VW Bus is Back — Now as an Electric Minivan
Volkswagen’s ID. Buzz reimagines its iconic Bus as a fully electric minivan, blending retro design with modern technology, a 231-mile range, and practical versatility to offer a stylish yet functional EV for the future.
Investigation Reveals Just How Badly California’s Homeless Shelters are Failing
Fraud, violence, death, and chaos follow a billion dollar investment in a temporary solution that is proving ineffective.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Economic & Planning Systems, Inc.
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research