How are roadways prioritized according to their importance?

The prioritization of roadways typically reflects their importance in facilitating transportation and commerce, as well as their connectivity and usage level. The correct sequence begins with the Interstate highways, which form the backbone of the national transportation system, offering the highest capacity and speed for long-distance travel and freight movement.

Following the Interstate system, the next tier consists of United States (US) primary roads, which provide essential connections between states and significant urban areas. These roads are critical for regional travel and commerce but are generally less prominent than Interstates.

Then, South Carolina primary roads come next, serving essential state-level connectivity and access to the local roadway network. These roads connect smaller towns and regions to larger highways, playing a vital role in intra-state travel.

Secondary roads rank lower in priority, as they primarily serve local traffic and may lead to more rural or less populated areas. Finally, city or county roads are more localized, focusing on access within communities rather than connecting broader regions.

This hierarchy emphasizes the focus on efficiency and connectivity, balancing between national highways and local access needs. Each category's prioritization reflects its role in the overall transportation network.