Final answer:
The maximum speed limit for motor buses at night on numbered U.S. and state highways typically matches the general posted speed limits for all vehicles, which can be around 55-70 mph or 88.5-112.7 km/h. Buses must follow these regulations unless specific rules for commercial vehicles are posted.
Step-by-step explanation:
The maximum speed limit for motor buses at night on numbered U.S. and state highways can vary widely depending on the state and specific highway in question; however, it is not unusual for buses to follow the posted speed limits applicable to all vehicles. In many cases, these speed limits can be around 55-70 miles per hour (mph) at night, which equates to approximately 88.5-112.7 kilometers per hour (km/h). However, no specific maximum speed limit for just buses is typically set apart from other vehicles. Instead, buses must adhere to the same speed regulations as other traffic, unless otherwise posted for larger commercial vehicles.
In a physics context, when converting a speed limit from km/h to m/s, we use the conversion factor of 1 km/h = 0.27778 m/s. Therefore, a 100 km/h speed limit is equivalent to approximately 27.778 m/s. Likewise, when converting speed from km/h to mph, the conversion factor is approximately 0.621371. So, for example, a speed limit of 80 km/h can be translated into roughly 49.7 mph.
It is important for drivers, including those operating motor buses, to always follow the legally posted speed limits to ensure the safety of all road users.