Final answer:
The speed limit for vehicles weighing more than 8,000 pounds on rural interstates varies by state, but general speed limits for interstates are around 100 km/h, which is approximately 62 mph.
Step-by-step explanation:
The speed limit for vehicles weighing 8,000 pounds or more on a rural interstate is not universally standardized and can vary from state to state.
However, if we consider the information provided, we can deduce the general speed limits for vehicles.
Some interstate highways have a speed limit of roughly 100 km/h, which converts to approximately 62 mph. Since 1.0 mile is about 1.609 kilometers, by dividing 100 by 1.609, you get the speed limit in miles per hour.
The typical highway speed limit mentioned is 60 mph, but this is usually for passenger vehicles rather than heavy vehicles.