This is because the U.S.A. is finally joining the modern world.
No states anymore officially use the metric system. However, there is one road that uses kilometres instead of miles: I-19 in Arizona (connects Tucson to Nogales).
All scientists measure in metric units. Scroll down to related links and look at "THE UNITED STATES AND THE METRIC SYSTEM".
THE METRIC SYSTEM WONDERLAND or THE WONDERS OF THE METRIC SYSTEM
The United States does not use the metric system.
You use exactly the same instruments to measure speed in the metric system as you use in any other system. For example, a speedometer, or a distance measuring device and a stopwatch. The difference is that these devices are calibrated in metric units, instead of old-fashioned units.
The standard unit of measure for length in the metric system is the meter.
To measure.
All science uses the metric system for measurements. Meters instead of feet, centimeters instead of inches. A person has to learn the "language" of science.
"Metric" is a whole system of weights and measurements. Many different devices are used to measure things in the system.
A ruler or a metric tape measure is commonly used to measure length in the metric system. These instruments typically have units of centimeters or millimeters for more precise measurements.
The metric system.
The Metre.