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A tractor is a slow vehicle typically associated with farming.
A tractor can be seen on Hayseed Farm.
The Grandpa's Grove Tractor is a vehicle on The Sims 3 Store, available as part of the Grandpa's Grove Tractor set for 733 SimPoints. It functions similarly to the The Sims 3 Store gondola and rollercoaster, in the sense that it is only able to drive on paths determined by objects.
Sims can do a "Hay Ride" with the tractor, and it can also fertilize or water nearby plants, and can vacuum nearby harvestable plants plants towards it, potentially speeding up mass harvests.
Tractors will use this to turn around and drive the other direction.