What type of signs typically have black borders on non-primary and local routes?

Direction signs typically have black borders on non-primary and local routes because these signs are designed to provide guidance and information about directions, distances, and locations to drivers. The black border distinguishes them from other types of signage, helping to make the information clear and easily visible to users. This visual cue is important for navigation, especially in areas where other signage might be present.

In contrast, the other types of signs serve different purposes, such as warning signs that alert drivers to hazards or changes in road conditions, speed limit signs that indicate maximum allowable speeds, and stopping signs that provide instructions to stop at intersections. Each of these categories of signs has its own specific design features that help drivers interpret the information quickly and effectively while driving.