For over eighty years, the Oklahoma Motor Carrier (OMC) magazine has provided OTA members with important information concerning their association and the trucking industry. Each issue of the OMC features an OTA member company, and update on state and national truckingFor over eighty years, the Oklahoma Motor Carrier (OMC) magazine has provided OTA members with important information concerning their association and the trucking industry. Each issue of the OMC features an OTA member company, and update on state and national trucking issues and highlights from OTA events. The OMC is read by over 3,700 people throughout the state of Oklahoma - including those outside the trucking industry. issues and highlights from OTA events. The OMC is read by 5,000 people throughout the state of Oklahoma - including those outside the trucking industry.