The systems have detected 215 drivers traveling the wrong way, MassDOT said. In 140 cases, drivers corrected course after receiving an alert from flashing roadside signs. The figures do not specify what happened in the other cases.

The rollout follows several deadly wrong-way crashes. In May, State Police Trooper Kevin Trainor was killed when a wrong-way driver struck his cruiser head-on on Route 1 in Lynnfield as Trainor was responding to a report of the driver. Over the weekend, a Triton Regional High School senior from Byfield died in a wrong-way crash on Route 1 in Revere.

The state’s initiative combines detection equipment with clearer signs and other road improvements. MassDOT says the measures are intended to help prevent drivers from entering roads in the wrong direction, alert drivers who do so and notify law enforcement so officers can respond.

Highway Administrator Jonathan Gulliver said MassDOT asked district leaders to assess interchanges in their regions and recommend where systems should go. The broader effort includes targeted safety upgrades at more than 800 locations statewide.

MassDOT aims to install more than 300 detection systems by the end of 2027. It has also bought 12 trailer-mounted systems that can be moved quickly to locations where a problem emerges.

For now, drivers receive alerts through flashing signs. A later phase could send warnings to vehicle dashboards or navigation apps, officials said.

“Wrong-way driving is one of those dangers where seconds can mean the difference between life and death,” State Police Lt. Brendhan Shugrue said.