Police in Alabama have located a semi truck belonging to a missing truck driver, but have asked the public for help in discovering the driver’s whereabouts.

56-year-old truck driver Wayne Orlando Mack, of South Carolina, was reported missing on January 25th after failing to show up for two scheduled deliveries in Alabama.

Mack’s employer, Hirshbach Trucking Company, used the truck’s on-board GPS to help authorities locate the missing rig.

Police found the abandoned rig parked behind a Jet Pep gas station in Valley, Alabama. Mack, however, was nowhere to be found.

According to AL.com, a clerk at the gas station told authorities that he saw Mack get into a white Nissan Maxima on January 25th; the day he was reported missing.

Mack is listed as a 6’6″ black male, weighing roughly 235 pounds, with salt-and-pepper hair.

The Valley Police Department asks anyone with information on Mack’s whereabouts, or disappearance, to call them at 334-756-5208.