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Difficulty: HardGuide and Informational Signs

On standard highway guide sign systems, a three-digit interstate route marker beginning with an odd digit (such as Interstate 395) designates a circumferential loop or beltway that connects back to the main highway at both ends.

Answer: Answer

Answer

False. A three-digit interstate route beginning with an odd digit indicates a spur route, whereas an even first digit designates a loop or beltway.
Under national highway signing standards, auxiliary three-digit interstate route markers are coded by their leading digit. Routes starting with an odd number (such as I-395) are spur routes that head into a city center or terminal destination without returning to the main highway. Routes starting with an even number (such as I-495) are circumferential loops or bypasses that reconnect to the primary interstate at both ends.

Step-by-Step Solution

1
Identify the type of guide sign being evaluated.
The sign in question is a three-digit Interstate auxiliary route marker.
Three-digit interstate route markers follow specific numerical rules to inform drivers about the geometry and destination of connecting highways.
2
Analyze the significance of the leading (first) digit in a three-digit interstate number.
An even leading digit (e.g., I-495, I-695) indicates a loop, beltway, or bypass that reconnects to the main interstate at both ends. An odd leading digit (e.g., I-195, I-395) indicates a spur route that branches off into a city or area without looping back.
Driver knowledge tests assess understanding of highway route numbering conventions so drivers can anticipate route behavior.
3
Evaluate the statement against the numbering rule.
The statement incorrectly attributes the loop/beltway description to odd-numbered first digits.
Since odd leading digits indicate spur routes, the statement is false.

Key Concept

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

Guide and Informational Signs

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