SUPPLEMENTAL MATERIALS

Chapter 7: Intersections and Traffic Flow

Key Quotes

“Traffic signals provide drivers with the privilege of driving at dangerous speeds when they are afforded a green light and it is their turn to proceed. In exchange, drivers accept longer delays and generally increased travel times due to red lights.”

“Traffic signals are used to create traffic congestion so that there can be gaps in the traffic flow.” — Click to Tweet

“[Traffic signals are] perhaps the greatest systematic waste of time and resources ever developed by humans.” — Click to Tweet

“Traffic signals are the most mindless and wasteful thing Americans routinely install to manage traffic. Removing nearly all of them within cities would improve our transportation systems and overall quality of life.” — Click to Tweet

“American intersection design starts with the assumption that people are idiots and must be treated as such. That is an incorrect assumption. The correct assumption is that humans are smart, intuitive, and thoughtful, and they should be treated that way.” — Click to Tweet

Six Corners (Springfield, Massachusetts)

Map of Six Corners

Six Corners Under Renovation

The Six Corners Intersection Improvements (City of Springfield)

• The Six Corners Intersection Improvements

MassLive News Coverage about Six Corners Roundabout

• “Rounding Off the Corners: Springfield Celebrates Completion of Six Corners Roundabout Project” (Behind Paywall)

Poynton, Regenerated

A community in decline, divided by decades of anti-social traffic engineering, is reunited and revitalized by streetscape redesign.

What If We Got Rid of Road Signs?

Versailles Shared Space

A shared space intersection in Versailles, France. From “The Streets of Paris,” by Charles Marohn

Willow Street Intersection (Brainerd, Minnesota)

Ramp Metering

• “Ramp Metering: An Unholy Alliance,” by Charles Marohn

• Twin Cities Metro Area Ramp Meter Study

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