Final answer:
The maximum speed limit for a vehicle towing another can vary and is influenced by state laws, road conditions, and vehicle types. Posted speed limit signs often provide guidance for towing vehicles. Safe driving speeds for towing also consider the ideal speed for turns and conditions like fuel efficiency.
Step-by-step explanation:
The maximum speed limit for any vehicle pulling another vehicle is not a one-size-fits-all answer and can vary based on state laws, road conditions, and the type of vehicles involved. However, vehicles pulling trailers or other vehicles typically must adhere to certain speed limits to ensure the safety of everyone on the road. In most cases, the posted speed limit signs will indicate if there is a lower maximum speed for vehicles towing trailers. Moreover, factors such as ideal speed for safely navigating curves can play a role in determining safe driving speeds.
It's important to note that the de jure (legal) speed limit may differ from the de facto (enforced) speed limit, which is the speed above which law enforcement may take action. Additionally, during specific conditions like the oil crisis in the 1970s, maximum speed limits for all vehicles, including those pulling others, were adjusted for fuel efficiency and safety reasons. Generally, for highways, the fuel-efficient cruising speed, which is also often safe for towing, is around 45-50 mph (approximately 70-80 km/h).