Terry,
Here is the answer: 
http://www.epa.gov/fedrgstr/EPA-IMPACT/2000/May/Day-15/i11493.htm.

Unfortunately, it is not mandatory to place km/h on speedometers but it is
mandatory to place MPH.  However, I have not seen a speedometer on any car
manufactured after 1977 for use in the U.S. that did not include both.

Phil

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Terry Simpson
Sent: Friday, September 10, 2004 1:36 PM
To: U.S. Metric Association
Subject: [USMA:31064] km/h on speedometers

Do cars in the U.S.A. have to have km/h on them by law?

Is it Federal or State law?

What date did it become mandatory? 

Is the actual law available online?

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