Tractors are divided into two subgroups based on the maximum speed they are designed for.

• a tractor a is designed with a maximum speed of 40 km/h.
• a tractor b is designed with a maximum speed of 50 km/h.

Tractors designed with a maximum speed of 40 km/h must be equipped with an orange-red triangular-shaped sign (known as an LGF sign).

Read more about the maximum speed allowed by different types of vehicles