Traffic engineers in two U.S. cities are testing an innovative approach to reduce congestion and improve safety by using adaptive traffic signals that default to red unless a vehicle is detected nearby. The system prioritizes drivers who maintain or fall below the speed limit, rewarding compliance with earlier green lights. Early signs suggest the method may be easing traffic flow and encouraging safer driving habits. Officials are now evaluating whether to expand the program based on its initial success.
On some streets in Albuquerque, New Mexico and Portland, Oregon, traffic signals default to red until a vehicle approaches. If drivers stay at or below the speed limit, they get an earlier green light. The strategy seems to be working.
