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Question

Difficulty: MediumGuide and Informational Signs

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

Answer: Answer

Answer

False. A three-digit Interstate route starting with an odd number is a spur route with a single connection point to the main highway, whereas a three-digit route starting with an even number is a loop or beltway that reconnects at both ends.
The statement is false because three-digit Interstate highway numbers starting with an odd digit represent spur routes that lead into a city or terminal point without returning to the main highway. Routes starting with an even digit are circumferential loops or bypasses that reconnect to the primary Interstate at two separate points.

Step-by-Step Solution

1
Identify the guide sign system and rule being tested.
The rule governs three-digit auxiliary Interstate route markers.
Interstate route markers use standardized numbering conventions to convey route geometry to drivers.
2
Recall the distinction between odd and even leading digits on three-digit Interstate markers.
Odd first digits indicate spur routes (one connection point), while even first digits indicate loops or beltways (two connection points).
This distinction allows drivers to know whether an auxiliary route will return them to the primary Interstate highway.
3
Compare the statement's claim against the established rule.
The statement incorrectly asserts that an odd first digit represents a loop connecting at both ends.
Because odd leading digits represent spurs rather than loops, the statement is false.

Key Concept

Three-Digit Interstate Auxiliary Route Marker Numbering Conventions
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Topics

Guide and Informational Signs

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