An ACFT was being taxedied to the gate when its right wingtip struck a catering truck that had been driven off the designated driving lanes and partially onto the taxiway. The flight crew reported that the truck was traveling in the same direction within the designated driving lanes when they last observed it. Shortly after the cockpit area of the ACFT passed the truck, they felt an impact. Witnesses reported the truck leaving the driving lanes as the driver was maneuvering around other ground vehicles that were obstructing the driving lanes.An ACFT was being taxedied to the gate when its right wingtip struck a catering truck that had been driven off the designated driving lanes and partially onto the taxiway. The flight crew reported that the truck was traveling in the same direction within the designated driving lanes when they last observed it. Shortly after the cockpit area of the ACFT passed the truck, they felt an impact. Witnesses reported the truck leaving the driving lanes as the driver was maneuvering around other ground vehicles that were obstructing the driving lanes.