A truck is 3.95 m high before loading. A rooftop refrigeration unit and load cover add 12 cm. What is the main legal/safety problem?

1. The truck may exceed the general 4.00 m height and may not fit under signed clearances
2. The truck automatically becomes Category B
3. The alcohol limit rises to 0.5 per mille
4. The vehicle becomes exempt from tachograph rules