Which states had them? Do any still? Were they required anywhere, or only for highway use?
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Bruce
NY has similar rules, most municipality and road construction contractors have plates on their machines.This is what I found for Maine. I don't recall seeing a plate on a tractor here.
Farm Vehicles, Motor Carrier Services, Maine Bureau of Motor Vehicles
Do I have to register my tractor?
Generally yes, if used on a public way. Farm tractors used only for farming and going to and from a farmer's field or lot do not have to be registered.