What does "interstate highway" mean?

one of the system of highways linking major cities in the 48 contiguous states of the United States

What is a synonym for "interstate highway"?

Common synonyms include: alley, arterial, artery, avenue, blind alley, boulevard.

Rare ·Advanced level

Noun

1
one of the system of highways linking major cities in the 48 contiguous states of the United States wordnet