SUMMIT — Flags are at half-staff around New Jersey Monday as Detective Matthew Tarentino is set to be laid to rest — almost a week after the Route 78 crash that killed him.

Funeral services are scheduled at Immaculate Conception Church on Mountain Avenue in Somerville at 10 a.m for the 29-year-old officer, followed by a funeral procession to Resurrection Cemetery in Piscataway. The procession route on Route 22 to Route 287 to Exit 9 in Piscataway will also cause delays on Monday afternoon.

Thousands of people, including members of law enforcement and fire fighters from around the state,  came to his wake on Sunday at the church, according to TAP Into Somerville.

Gov. Chris Christie ordered flags at state buildings to be flown at half staff on Monday in Tarentino's honor.

(Summit Police)

"He served his state with courage, professionalism, and commitment to the finest ideals and traditions of the Summit Police Department. It is with deep sadness that we mourn the loss of Detective Tarentino, and we extend our sincerest sympathy to his family and loved ones," Christie wrote in his order.

A YouCaring page created to help Tarentino's wife Victoria, who is pregnant, and their two small children Robert, 3, and Raymond, 2, has collected more than $400,000 in pledges.

State Police said Archibald McGlashan, 68, of Bethlehem, Pennsylvania, was the driver of a gray Toyota Camry that went across the grassy median from the westbound lanes onto the eastbound lanes, hitting Tarentino’s car last Tuesay morning. The collision in Bernards caused Tarentino’s car to hit a third vehicle also heading east, according to State Police.

State Police have not determined what caused McGlashan to drive onto the wrong side of the interstate.

Contact reporter Dan Alexander at Dan.Alexander@townsquaremedia.com.

More from New Jersey 101.5:

Sign up for the NJ1015.com Newsletter

Get the best of NJ1015.com delivered to your inbox every day.