Final answer:
The maximum speed limit for heavy trucks on the highway at night is generally around 55 to 65 miles per hour in many states in the United States.
Step-by-step explanation:
The maximum speed limit for heavy trucks on the highway at night varies depending on the state or country. However, in the United States, the maximum speed limit for heavy trucks is generally lower than that for regular passenger vehicles. For example, the maximum speed limit for heavy trucks on the highway in many states is around 55 to 65 miles per hour. It is important for heavy truck drivers to follow the speed limit to ensure their safety and the safety of other drivers on the road.