I used to think we should switch but now I really don't care. The costs of changing the signs on the freeways alone would be astronomical.
By the way...
Not all engineers use metric. I work in the air quality field and I've NEVER used metric measurements at work. Every once in a while the measurement for a fan will be in standard m3/min but usually it is in both with the English system in bold and on top. Everything is expressed in feet, miles, tons, pounds, etc.
English units aren't that difficult. My engineering school was very good at making sure we were comfortable using either one.
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