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."
Read the full story: Study shows more bicyclists on road means fewer collisions
Op-ed: True bike safety requires more than the 'Dutch reach'
Making roads safe for all users takes policy and cultural changes that go beyond small behavioral interventions.
Is that an e-bike or electric motorcycle? A New Washington law clarifies.
New regulations require electric motorcycle riders to have a driver's license.
Philadelphia adds new safety measures to 13th Street bike lane
The city is piloting plastic, modular bike lane separators that buffer cyclists from the adjacent vehicle lane.
Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.
California plans to bury El Niño’s downpour
If the state plays its cards right, it may be able to store a billion acre-feet of El Niño’s water in aquifers.
Desperate measures: Advocates weigh draining Lake Powell to fill Colorado River
Draining the reservoir could reduce evaporation losses by a couple hundred thousand acre-feet.
In Texas, data centers are swallowing promised parkland
Residents who moved to Taylor, Texas for a rural community now have to contend with three data centers in their backyard.
How a Chicago-sized wind farm beat the odds and powered on
The project spanned five presidential administrations and a standoff with a U.S. military base.
MTA gives itself 30 days to transform pit into basketball court
The site has been under construction since 2022; the city originally estimated it would finish the court in 2024.
FREE Course: Walkable City 1: Why Walkability?
After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.
Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold
The course focuses on the opportunities and imperatives that shape reinvention of mall sites.
City of Rosemead
Rutgers University, Edward J. Bloustein School of Planning and Public Policy
One Hundred Miles
Hunter College, City University of New York (CUNY)
The Architects Foundation
University of Cincinnati Online
City of Cambridge
Montrose County
The Pocatello Development Authority