The driver of a Mitsubishi Galant faces counts of negligent homicide, negligent injuring and reckless operation after two Iberia Parish public works employees were killed Tuesday afternoon while working on the shoulder of the U.S. 90 South Service Road, State Police said.

Alicia Marie Mire, 26, of New Iberia, who was driving the 2006 Galant, drifted onto the shoulder, rear-ending a work truck which then hit Ross Migues, 48, of Lydia, and Jody Anthony, 57, of St. Martinville, who were putting up rezoning signs, said Master Trooper Brooks David, a State Police spokesman.

Mire and her passenger were not seriously injured, David said. The two, who were wearing their seat belts, were transported to a hospital, he said.

Migues and Anthony were pronounced dead at the scene by the Iberia Parish Coroner’s Office, David said. Their truck had been parked on the shoulder with its lights on.

David said troopers don’t know what caused Mire to drift onto the shoulder and they are unsure if she was impaired at the time of the crash. A toxicology sample was submitted to the State Crime Lab.