You are driving a truck with a maximum authorised mass of 6 t for commercial freight transport purposes. What is the latest time you must stop driving in order to take a break?

For commercial freight transport with a truck over 3.5 tons, German and EU rules require that you take a break after no more than 4.5 hours of driving. After this period, you must take at least a 45-minute break before continuing. This regulation is meant to prevent fatigue and ensure road safety. Since you selected "After 4.5 hours," you are correct; you must not drive longer than this without a proper rest. This rule applies regardless of whether you feel tired or not—always plan your stops accordingly.