Actually 1988 amendments to the 1975 Metric Conversion Act. 

Well, no President since it was signed has ever enforced it or demanded the 
annual reviews of progress it requires, so several agencies got used to making 
no or only token progress, exploiting the loopholes to continue Customary, etc.
Agencies that took it seriously triggered laws from Congress that basically 
said, In the name of God, DON'T do what we said you had to do.  We didn't mean 
it, not really."

The FHWA was  admonished for forcing metric road designs and metric signage on 
the States. Congress passed a 1995 law forbidding them to, and the States 
reverted to Customary road designs. As a "poison pill" for metric signage, 
several States (eg California) passed laws that not only must the State agree 
to metric signage but every local government along the way. Metrication of road 
signs goes from a problem of convincing 50 states to 50000 or so local 
governments.
The agency in charge of metric design of federal buildings was told they HAD to 
consider Customary dimension bricks and lighting fixtures. Of course, their 
dimensions don't fit modular metric design, turning the process into endless 
conversions and dual dimensioning, instead of actually designing in metric.
You didn't think Congress actually meant what they said about metric being 
preferred, did you?  It's only "preferred" when it doesn't inconvenience their 
major political donors.  If you think I am joking, the laws stymieing 
metrication as above are on the USMA Metric Laws page.

    On Sunday, October 6, 2019, 8:06:06 PM EDT, [email protected] 
<[email protected]> wrote:  
 
 This implemented the Metric Conversion Act of 1975 at the U.s. Government 
level with specific directives to convert.

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