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Difficulty: HardGuide and Informational Signs

On United States interstate route marker guide signs, a three-digit route number beginning with an even digit (such as Interstate 405) indicates a spur highway that connects to the primary interstate at only one end.

Answer: Answer

Answer

False. A three-digit interstate route starting with an even number signifies a loop or beltway connecting to the main interstate at both ends, whereas an odd starting number signifies a spur route connecting at only one end.
The statement is False. In United States guide and informational sign conventions, a three-digit interstate starting with an even digit represents a loop or circumferential beltway connecting to the highway at both ends. Conversely, a three-digit interstate starting with an odd digit represents a spur route connecting at only one end.

Step-by-Step Solution

1
Analyze the structural conventions for three-digit auxiliary interstate route marker signs.
Auxiliary interstates use three-digit numbers where the leading digit specifies the geometric relationship to the primary interstate corridor.
Standardized numbering allows drivers to recognize route types directly from informational route marker signs.
2
Apply the rule governing even versus odd leading digits on auxiliary interstate route shields.
Even leading digits (2, 4, 6, 8) indicate loop roads or beltways that reconnect to the primary interstate at two separate junctions. Odd leading digits (1, 3, 5, 7, 9) indicate spur routes that lead off the main highway and terminate or connect at only one end.
Understanding this distinction helps drivers determine whether a bypass route will bring them back to the main highway.
3
Compare the statement's claim against the established sign conventions.
The statement incorrectly claims that an even first digit denotes a spur connecting at only one end.
Because the statement reverses the definitions of even and odd leading digits, the statement is false.

Key Concept

Auxiliary Interstate Route Marker Numbering Conventions
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Topics

Guide and Informational Signs

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