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Difficulty: MediumGuide and Informational Signs

While navigating the national Interstate Highway System using standard guide signs and route markers, a driver notes that primary two-digit Interstate highways follow a specific numbering convention. What direction of travel is indicated by an odd-numbered primary Interstate route, such as Interstate 5 or Interstate 95?

  1. The highway primarily routes traffic in a north-south direction.Answer
  2. B
    The highway primarily routes traffic in an east-west direction.
  3. C
    The highway forms a full circumferential beltway or bypass around a city.
  4. D
    The highway is designated as a scenic secondary connector to state parks.

Answer

An odd-numbered two-digit Interstate highway indicates that the route primarily runs north and south.
Under standardized U.S. highway guide sign rules, primary two-digit Interstate highways with odd numbers run north and south across the country (such as I-5 on the West Coast and I-95 on the East Coast).

Step-by-Step Solution

1
Identify the standard numbering rules for primary two-digit U.S. Interstate Highway route markers.
Primary U.S. Interstates use one- or two-digit route numbers posted on blue-and-red shield guide markers.
Guide sign standards use systematic numbering to help motorists navigate without relying solely on map orientation.
2
Apply the directional rule for odd versus even Interstate route numbers.
Odd route numbers (e.g., I-5, I-15, I-95) run north-south (increasing from west to east), while even route numbers (e.g., I-10, I-80, I-90) run east-west (increasing from south to north).
This uniform standard ensures drivers can immediately infer cardinal direction of travel from route numbers on guide signs.

Key Concept

Interstate Route Numbering Conventions
Estimated Time:1m 0s
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Topics

Guide and Informational Signs

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