Final answer:
The 'mph' sign indicates the maximum speed allowed in miles per hour. It's important for safety and legal reasons to adhere to this speed limit, and understanding unit conversions can help when traveling internationally.
Step-by-step explanation:
The sign 'mph' stands for miles per hour and indicates the maximum speed at which a vehicle is legally permitted to travel on a particular stretch of road. Speed limits are enforced to ensure the safety of all road users and are typically set by the local or national traffic authorities. While there is usually a small buffer over the speed limit that law enforcement may allow, consistently driving over the speed limit is both illegal and unsafe, and can result in a traffic citation.
Understanding the conversion between metrics is essential for global awareness, especially when traveling. For example, 1 mile per hour is equivalent to approximately 1.609 kilometers per hour or about 0.44704 meters per second. Being able to convert between these units can help drivers understand speed limits in different countries where the metric system is used.