When is a driver of a vehicle weighing more than 6,000 kg required to take a half hour brake?

1. After 4.5 hours of non-stop driving.
2. After 6 hours of non-stop driving.
3. Correct answer: After a maximum of 4 hours of non-stop driving.
4. After 5 hours of non-stop driving.

WhyA driver of a vehicle over 6,000 kg takes a half-hour break after at most 4 hours of non-stop driving. Not after 4.5 or 5.