One highway in Arizona is trapped in the metric system


Recently on the Hagerty Forums, a discussion of why gas is sold in gallons but engine sizes are in liters brought up an interesting fact. While most Americans are more or less foreign to the metric system, one stretch of road in southern Arizona uses metric units. I had to find out why.

This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2018/10/08/arizona-highway-uses-metric-system