The Texas Department of Transportation is alerting motorists to the agency’s planned closure of southbound U.S. Highway 75 in Sherman Saturday morning, to allow Sherman Police to further investigate a fatal collision which occurred on the freeway late last year.

The closure is scheduled to last from 6:30 a.m. to 10 a.m. and will effect only the southbound lanes. Traffic will be rerouted onto the service road at exit 54A, where motorists can continue past Shepard Road and re-enter the freeway at the next on ramp.

“Motorists should reduce their speed and remain alert when approaching and traveling through this short detour, and pay attention to all traffic controls that may be in place,” TxDOT said in an emailed press release. “They should also avoid distractions such as cell phones, eating, drinking, or car audio or navigation systems.”

Sgt. Brett Mullen said investigators with the department’s Critical Accident Team will use the closure to digitally map and review the scene. Mullen said Roger Newton, 58, of Lewisville was killed in the December 2017 wreck when the Toyota passenger car he was riding in collided with the rear of a semi trailer.

“On any fatality wreck, we do these reconstructions so we can know exactly what happened,” Mullen said. “That way, if there’s any kind of litigation or criminal prosecution, we’ve covered all our bases — we’ve fully reconstructed the accident. So this almost is a routine kind of thing for these cases.”