> With no driver or cab, autonomous tractors would be lighter, doing less damage in compressing the soil. The more likely development is that the tractors will

> With no driver or cab, autonomous tractors would be lighter, doing less damage in compressing the soil. The more likely development is that the tractors will be designed to operate continuously for a week at a time (or more), because there's no need for operator shift changes, and equipment utilisation is important. And so is planting and harvesting when conditions are right. Bigger, heavier tractors on bigger farms. Some farms are already big enough that it takes a few days to make a circuit of a field.