What prefix is used for interstate signing in the Commonwealth?

The correct choice indicates that the prefix "PR" is used for interstate signing in the Commonwealth. This prefix is specifically designated for marking and indicating interstate highways and routes within the jurisdiction of the Commonwealth. It enhances clarity and consistency in wayfinding for travelers navigating through the area, showing that the route is interstate in nature.

Understanding prefixes is essential in transportation logistics as it helps in identifying the jurisdiction and type of roadways. The use of "PR" reflects the standardized approach to roadway signage that aligns with both state-specific and national conventions in road marking. Such prefixes are crucial for ensuring that drivers can efficiently identify the routes and navigate effectively, which is especially important for interstate travel.

Recognizing the significance of these prefixes contributes to better traffic management and improved motorist information systems, making it easier for drivers to understand which routes are intended for long-distance travel across state lines.