What percentage of total domestic tonnage did trucks ship in 2015?

The correct percentage of total domestic tonnage shipped by trucks in 2015 is 70.1%. This figure highlights the dominant role that trucks play in the freight transportation industry within the United States. Trucks are essential for shipping goods over short to medium distances and have a higher capacity for flexibility and reach compared to other modes of transport, such as rail or air. The significance of the trucking sector is reflected in its ability to handle the bulk of the country's freight, which is crucial for supply chain efficiency and economic activity.

Analyzing the other percentages shows that while values such as 60.1%, 66.4%, and 81.5% might suggest substantial contributions, they do not align with the actual data reported for that year. For instance, an 81.5% figure would imply an overwhelming dominance that surpasses what the overall transportation statistics indicate for truck freight in 2015, where trucking network logistics had yet to reach that level. Meanwhile, lower percentages would underrepresent the extensive reliance on trucking for freight transport during that time.