A special vehicle that lacks braking signalling must not exceed a maximum speed of...

Special vehicles and combinations of vehicles, also special, even if only one of those making up the combination has such a nature, if they lack braking signalling, if they tow a trailer, or if they are motor cultivators, the maximum speed at which they are permitted to travel is 25 km/h. Special vehicles capable of reaching 60 km/h on a flat road will have a maximum speed of 70 km/h, and for the rest of special vehicles their maximum will be 40 km/h.