What does "mph" stand for in the context of road speed?

"mph" stands for "miles per hour," which is a unit of speed used to indicate how many miles a vehicle can travel in one hour. This measurement is commonly found on speed limit signs, allowing drivers to understand safe and legal travel speeds on various roads. Using miles per hour is crucial for maintaining traffic flow and safety, as it provides a standard way to communicate speed limits and ensures all drivers are aware of the expectations for their driving behavior within a given area. Other options like "minutes per hour," "maximum per hour," and "motor power house" do not accurately reflect common units of speed or are not used in this context, thus reinforcing that "miles per hour" is the correct interpretation of "mph."