Are special vehicles self-propelled or towed (do they lack propulsion)?
Special vehicles
Explanation
**Special vehicles** can be either **self-propelled** or **towed**. This means that some have their own engine to move, while others need to be pulled by another vehicle.
- **Self-propelled special vehicles**: These vehicles have their own engine that allows them to perform specific tasks. Examples include **tractors** and **automotive machines**.

- **Towed special vehicles**: These do not have their own engine and must be pulled by another vehicle. Examples are the **agricultural trailer** and the **towed machine**.

Therefore, special vehicles can be of both types: self-propelled or towed.
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