Why Only One US Highway Uses The Metric System - Jalopnik

A sign along Interstate 19 in Arizona displaying distances in kilometers

Arizona Department of Transportation

While most of the globe adopted the metric system at least 50 years ago, the United States remains one of the few holdouts refusing to join the international standard. However, the country isn't completely devoid of government metric usage. Interstate 19 uses metric signage, and it's the only U.S. highway that does so. The 63-mile route stretches from Nogales on the Mexican border to Tucson, entirely within Arizona. I-19's metric signs are a vestige of a federal flirtation with joining the final wave of major countries to convert to the metric system.

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Photo: Jennifer Eden

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Nvidia CEO Jensen Huang speaks during the keynote address at Salesforce's Dreamforce conference at the Moscone Center on Sept. 15, 2026 in San Francisco, California.

Benjamin Fanjoy | Getty Images

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I’m a KPMG forward-deployed engineer. AI has moved my job beyond writing code.

I’m a KPMG forward-deployed engineer. AI has moved my job beyond writing code.

As told to

Lakshmi Varanasi

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This Ford exec put her family's Claude assistant on a PIP. ChatGPT has taken over.

By

Ben Shimkus

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Whitney Stefko Dover, a Ford executive, in her home office.

This mom vibe coded a family chief of staff. She's switching agents and putting the OG on a PIP.

Whitney Stefko Dover