Anyone who drives Route 1 knows the routine: stop, wait, repeat.

A new $3.4 million project aims to make the corridor move more smoothly by replacing the town’s fixed-timing traffic lights with a system that can adjust in real time.

Greenwich’s Department of Public Works is installing adaptive signal technology at all 29 traffic lights along Route 1, from the Port Chester border to Stamford. The system will monitor traffic patterns and adjust signal timing automatically — including during major backups, such as when an accident on I-95 sends drivers onto local roads.

The project will be fully funded by a Federal Highway Administration grant through the Congestion Mitigation and Air Quality Program, meaning there will be no cost to Greenwich taxpayers.

Route 1 serves as an official I-95 detour route near Exit 5, and traffic crashes have been a longstanding concern. The stretch near Byram and Pemberwick roads has seen 92 crashes, including 10 involving injuries, since 2019, according to Safe Streets Greenwich data.

The project will also add ADA-compliant pedestrian improvements, including audible crossing signals and upgraded curb ramps.

After public feedback, the town revised its plans so that 18 intersections in Central Greenwich and Cos Cob will keep pedestrian-only crossing phases. The remaining intersections will receive leading pedestrian intervals, giving walkers a few extra seconds to enter the crosswalk before vehicles receive a green light.

DPW completed the final design phase in January and was preparing to move toward construction. Officials expected work to begin in 2026 and take about a year, though the town has not confirmed whether a contractor has been selected.

Residents with questions can contact project manager Michael Kiselak at 203-622-3839.