What percentage of total highway miles does the arterial system represent in the U.S.?

The arterial system in the U.S. is a crucial part of the highway network designed to facilitate the movement of traffic between major corridors. It represents about 11% of total highway miles. This percentage reflects the arterial system's role in connecting significant urban areas and accommodating a larger volume of traffic compared to local roads. Understanding this proportion is important for recognizing the impact of the arterial system on national transportation efficiency and planning, as it serves as a vital link for both freight and passenger travel. Knowing that it constitutes a significant portion of highway infrastructure helps in assessing priorities for maintenance, upgrades, and traffic management initiatives in the context of overall highway safety and efficiency.