How is speed typically measured?

Speed is most commonly measured in miles per hour (mph) in the United States, making this the correct answer. This unit of measurement is used on road signs, which helps drivers understand the speed limits and ensure they are adhering to the laws while driving. The use of mph is standard in various contexts, including traffic regulations, vehicle specifications, and distance traveled within a specific time frame.

While kilometers per hour is widely used in many other countries, especially those that utilize the metric system, it is not the typical measurement for speed in the U.S. Similarly, feet per second and yards per minute are less common units for expressing speed in everyday driving scenarios, as they are more relevant in specific contexts such as athletics or specialized circumstances rather than general road use. Thus, the most recognizable and applicable measurement for speed in a driving context in Utah and throughout the U.S. is indeed miles per hour.