Final answer:
The top speed limit for heavy trucks on the open highway in the daytime is typically around 60 mi/h (96 km/h). This is a general standard for safety and operational reasons, although actual limits may vary by location.
Step-by-step explanation:
The question you've asked pertains to the top speed limit for heavy trucks on the open highway during daytime hours. While specific speed limits can vary by jurisdiction, we can look at general standards for the purpose of this discussion. It's important to clarify that the speed mentioned in the reference, such as 900 km/h or 560 mi/h, is far beyond any legal or safe driving speeds on highways. These figures are more in line with land speed records than traffic regulations. Typical highway speed limits for heavy trucks are considerably lower for safety reasons.
According to the figures in your reference, the typical speed limit is around 60 mi/h, which is about 27 m/s or 96 km/h. This is the established speed limit to maintain traffic flow while ensuring the safety of all highway users, including those in heavy trucks. Notably, these limits account for the ability of larger vehicles to stop and maneuver safely. Different areas may have variations in these limits, especially in urban areas or places with specific traffic concerns, but 60 mi/h is a common standard in many regions. Moreover, there are also considerations regarding fuel economy and the operational limits of 'big rigs' on long-haul trucking commitments.
Therefore, while the student's question does not specify a particular location and thus a specific speed limit, it can be inferred that the standard highway speed limit for heavy trucks during daytime is around 60 mi/h or 96 km/h in many areas. This aligns with the reference provided, which suggests that the de jure speed limit is what is posted on road signs, and is the legally enforceable limit for highway traffic.