A person meeting the definition of farm vehicle driver who operates a straight truck does not require a medical card. A farm vehicle driver operating an articulated farm vehicle in interstate commerce requires a medical card at all times. A farm vehicle driver operating a farm vehicle (straight or articulated) in intrastate operations within 150 air miles of the farm does not need a medical card.
Note: Custom harvest operations do not meet the farm vehicle driver definitions, but custom harvest vehicle drivers are exempt from the medical card requirements when transporting machinery, supplies, crops, etc. Further info on medical cards can be found in Part 391.