**Test vehicles** are allowed to exceed the maximum speed limit of a road by **30 km per hour**, as long as they follow their itinerary. This means that if the maximum permitted speed on a road is 90 km/h, a test vehicle could travel up to 120 km/h on that same road.

- The **maximum speed** is the limit that should not be exceeded on a road, unless it is a test vehicle following its specific itinerary.
- Test vehicles have an exception that allows them to exceed this limit by **30 km/h**.

This regulation is important to allow test vehicles to conduct their tests effectively, without compromising road safety.