What is a primary responsibility of the Department of Transportation (DOT)?

The primary responsibility of the Department of Transportation (DOT) is to govern the economic aspects of the transportation industry. This involves overseeing various modes of transportation, including highways, air travel, railroads, and transit systems. The DOT ensures that the transportation infrastructure operates efficiently and safely, which directly impacts the economy by facilitating trade, commuting, and the movement of goods and services.

In addition to economic governance, the DOT establishes and enforces regulations related to safety, accessibility, and environmental considerations within the transportation sector. This role is crucial for maintaining a reliable transportation network that supports the country's economic goals and enhances the overall quality of life for its citizens.

The other choices reflect responsibilities that belong to different agencies or departments; for example, regulating hotel chains pertains more to tourism or commerce departments, health and safety standards typically fall under health departments, and issuing passports is the responsibility of the Department of State. Therefore, the option indicating the DOT's role in governing the economic aspects is the most accurate representation of its primary responsibilities.