Three-digit interstate numbers indicate what?

Three-digit interstate numbers indicate what?

• A. A bypass of a city (the last two digits tell you which interstate you will join up with)
• B. A route through a city center
• C. Elevation grade of the highway
• D. A toll road

Answer: (A)

Three-digit interstates are auxiliary routes connected to a two-digit primary interstate. The last two digits show the parent highway you’ll join. The first digit indicates the type: an even first digit usually means a beltway or bypass around a city, while an odd first digit typically signals a spur that goes into the city. So the idea that a three-digit Interstate indicates a bypass around a city is the common and useful interpretation for many of these routes, and the trailing two digits tell you which main Interstate you’re linked to. Keep in mind the odd-first-digit cases function more as spurs into the city, not bypasses.

Three-digit interstates are auxiliary routes connected to a two-digit primary interstate. The last two digits show the parent highway you’ll join. The first digit indicates the type: an even first digit usually means a beltway or bypass around a city, while an odd first digit typically signals a spur that goes into the city. So the idea that a three-digit Interstate indicates a bypass around a city is the common and useful interpretation for many of these routes, and the trailing two digits tell you which main Interstate you’re linked to. Keep in mind the odd-first-digit cases function more as spurs into the city, not bypasses.