Final answer:
The question is seeking the maximum speed limit for vehicles towing trailers on a two-lane undivided highway. While the references provided give various related facts about speeds and highway travel, they do not offer a definitive answer. Typically, a common speed limit for towing on such roads is 55 mph, but local regulations should be checked.
Step-by-step explanation:
The question seems to be related to the laws and regulations governing road traffic, specifically the maximum speed limit for vehicles towing trailers on a two-lane undivided highway. However, the reference information provided deals with various aspects of vehicle speed in different contexts, including the conversion of speeds from kilometers per hour to miles per hour and meters per second, the impact of drag coefficient on vehicle power, and the history behind certain speed limits set during the 1970s oil crisis in the USA.
For the specific question of maximum speed limit for vehicles towing trailers on a two-lane undivided highway, the provided options are:
a.mph 60
b.mph 70
c.mph 55
d.mph 65
Typically, in many jurisdictions, the speed limit for vehicles towing trailers is lower than that for those not towing, to ensure safety due to reduced maneuverability and increased stopping distances. The common speed limit for such vehicles is usually around 55 mph, but this can vary depending on the state or country. As the provided references do not include this specific information, the student should check their local road traffic regulations for the most accurate and up-to-date information.