Here’s a way to save lives, curb traffic jams and make commutes faster and easier − ban left turns at intersections

Even though research supports the change, most cities have been slow to ban left turns at even the most congested intersections.

By: Vikash V. Gayah, Penn State, The Conversation

Outlets: The Conversation

Published: July 25, 2026

Words: 1,153

Last Updated: 3 weeks, 4 days ago

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By Vikash V. Gayah, Penn State

More than 60% of traffic collisions at intersections involve left turns. Some U.S. cities – including San Francisco, Salt Lake City and Birmingham, Alabama – are restricting left turns.

Dr. Vikash Gayah, a professor of civil engineering at Penn State University and the interim director of the Larson Transportation Institute, discusses how left turns at intersections cause accidents, make traffic worse and use more gas.

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