Traffic lights might see a fourth signal as self-driving cars become more practical. Getty Images/iStockphoto. The researcher’s latest plans differ from a 2020 model of a four-light intersection.

Traffic lights would enter a "white phase" when coordinating AVs through traffic. The lack of traffic light color would also indicate to human drivers that autonomous vehicles are being controlled.

The mere presence of a traffic light system should be a red flag in itself. When a food requires such elaborate packaging and nutritional gymnastics to appear healthy, it's a sign that what you're ...

About 10 years ago, several colleagues and I implemented traffic light labels (green=healthy; yellow=less healthy; red=unhealthy) and healthy choice architecture in the cafeteria at Massachusetts ...