The National Transportation Safety Board recommends that the Federal
Aviation Administration:

> Require the use of physical devices or other means to clearly indicate to
> flight crews of arriving and departing aircraft that a runway is closed.
> (A-03-05)
> Study the safety and design of existing safety barrier and lighting
> equipment intended for placement on or near runways during closures and
> establish safety standards for frangibility, as well as other properties
> (including, but not limited to, wind resistance and conspicuity of lights
> and markings under various weather, lighting, and visibility conditions).
If
> existing equipment does not meet these standards, new equipment should be
> developed. (A-03-06)
>
> http://www.ntsb.gov/recs/letters/2003/A03_05_06.pdf
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