Final answer:
The maximum speed limit for vehicles weighing more than 8,000 pounds and non-commercial buses depends on the location and type of road, but it is generally lower than for smaller vehicles.
Step-by-step explanation:
The maximum speed limit at all times for vehicles weighing more than 8,000 pounds and non-commercial buses may vary depending on the location and the type of road.
However, in general, large trucks and buses have lower speed limits than smaller vehicles due to their size and weight.
In the United States, for example, the maximum speed limit for trucks and buses on rural interstates is typically 60-70 mph, while on urban interstates it is often 55-65 mph.