Final answer:
A standard width for carts was indeed adopted as part of the historical move towards standardized units of measurement to assist with commerce and trade.
Step-by-step explanation:
It is true that a standard width was adopted for carts. This concept dates back to the time when measurements were based on human dimensions, such as the inch representing the distance between knuckles on the finger. As the requirements of commerce grew, standardization became necessary, leading to nations creating their own standardized units of measurement. It was not until the mid-18th century that there were efforts to establish a uniform, international set of standards. The adoption of a standard cart width is a reflection of this push towards standardization to facilitate trade and travel between regions.