A very pure soft iron, used in particular for roadside guardrails.
- It does have its difficulties, no run off areas, tight Armco, an interesting track surface with gutters and manhole covers, but with Monaco, they don't really bother you.
- Other safety advances include improvements to marshal posts, new gravel traps and Armco fencing around the circuit.
- There being no catch fencing or Armco to deflect him, he died from hitting a tree.
Early 20th century: acronym from American Rolling Mill Company.
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