Which additional system, absent in other types of vehicles, is found in tractors?

1. Correct answer: A hydraulic system for lifting and operating attachments.
2. A standard electro-hydraulic steering system.
3. An Air brake system with a condensed air system.
4. A hydrostatic differential-lock system.

WhyA tractor has a hydraulic system that lifts and operates attachments. Other vehicles do not have it.