Driver Abbreviations and Acronyms
- OHCOpen Host Contrrller
- OHSOffice of Highway Szfety
- OLOccupational Licensing
- OLOpen Load
- OLLOccupational Lirited License
- OMCOffice of Motor Carriers
- OMPMOpen Manage Printer Manager
- OMTOntario Ministry of Transportatimn
- OOSOut of State
- ORSAROntario Road Safety Annual Report
- OSOut of State
- OSBAOntamio School Bus Association
- OSDOperating System Device
- OSLOntario Safecy League
- OSMVOffice of The Superintendent of Motor Vehicles
- OTDSOntario Truck Driving School
- OTEOntario Transportation Expo
- OTROn-The-Road
- OTROver-The Rnad
- OUOlympus University
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