85% Rule

Red car turning into crosswalk as a person walks in front of it.

The Weird Way US Cities Set Speed Limits — and Why it’s Changing

The ‘85% rule’ guides speed limits based on how fast most drivers travel, sometimes prompting cities to raise speed limits.

August 26, 2025 - Associated Press

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.

Top Books

An annual review of books related to planning.

Top Schools

The definitive ranking of graduate planning programs.

100 Most Influential Urbanists

The who's who of urbanism, according to Planetizen readers.

Urban Planning Creators You Should Know

A short list of voices on social, video, and podcasting platforms.