85th Percentile

Cars Are Outgrowing Their Parking Spaces
As American vehicles grow taller, wider, and longer, more of them are having a hard time fitting in traditional parking spaces.

The 85th Percentile Rule, Explained
A video explainer of the notorious traffic law that explains why some cities have to raise speed limits to enforce traffic safety.

It's Time To Reconsider How Speed Limits Are Set
Speed limits are currently determined by a calculation that considers only the status quo of vehicular velocity. Standard practices for speed limit setting and legislators should prioritize the safety of community members, according to this article.

NACTO Recommends Default Safety Setting for Speed Limits
A step toward an overhaul of the way speed is managed on city streets around the country.

How the Law Enshrines Car Dependence
Land use regulations provide exhibit A in this indictment of the American legal system's support for a murderous and destructive dependence on automobiles for transportation.

California Bill Sets Its Sights on Lower Speed Limits
A proposed bill in the California State Assembly would make it easier for local jurisdictions to set lower speed limits, sidestepping the controversial 85th percentile rule.

Raising Speed Limits in the Name of Traffic Safety
Business Insider offers a platform for an argument favored by the National Motorists Association and a particularly vocal Michigan state police officer: that speed limits are too slow to be safe.

The Origins of Speed Limits
Motor vehicle crashes claim over 30,000 lives per year, with related costs in the hundreds of billions. While we sometimes view that frightening statistic as inevitable, there are reasons to reexamine speed limits and how we set them.
Caltrans
San Francisco Municipal Transportation Agency
City of Orange
Chaddick Institute at DePaul University
HUD's Office of Policy Development and Research
HUD's Office of Policy Development and Research
Montrose County
Wichita-Sedgwick County Metropolitan Area Planning Department
City of Lomita
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.