The officer, who has not been identified yet, was on duty helping another driver on the northbound side of the highway at 12:40 a.m. when the crash happened, according to police.
“Despite lifesaving efforts by emergency responders, the officer succumbed to injuries sustained in the collision,” Uxbridge Police said in a statement.
“This is a devastating loss for our department and our community,” said Uxbridge Police Chief Marc Montminy. “Our thoughts and prayers are with the officer’s family, loved ones, and fellow officers during this incredibly difficult time.”
Counseling is being made available to officers and other members of the Uxbridge Police Department. Black bunting was hung outside the Uxbridge police station late Wednesday morning and a flag was lowered to half-staff to honor the officer. Police departments from across Massachusetts offered condolences on the Uxbridge Police Facebook page.
CBS Boston
Route 146 north at exit 6 was closed through the morning commute, according to the Massachusetts Department of Transportation (MassDOT).
More than five hours after the crash, there was a solemn procession off of Route 146 led by Massachusetts State Police, followed by the medical examiner and fellow police officers.
CBS Boston 
It’s not clear yet how many vehicles were involved in the crash, but roads across Massachusetts have been icy due to freezing rain overnight.
No other information is available at this point in the investigation.
Uxbridge is about 45 miles southwest of Boston and 25 miles north of Providence, Rhode Island.
