Final answer:
The exact minimum distance by law when driving a bus on a highway at speeds exceeding 60 km/hr, except when passing, can vary and is not provided in the provided references. Local or national legislation should be consulted for the specific figure.
Step-by-step explanation:
The minimum distance required by law when you are driving your bus on a highway at a speed in excess of 60 km/h except when overtaking and passing another vehicle is not explicitly provided in the provided reference information. Therefore, without specific traffic regulations or the context of a country's specific road law, it's impossible to give a definitive answer. Generally, driving laws stipulate reasonable and safe following distances, which can vary depending on traffic, weather, and road conditions. You might find the exact figure within your local or national vehicle and traffic legislation or through official driving manuals or resources.