Dave Parker's Crash Course article (NCE 2 February) omits to mention a most important name which should appear in any dissertation on crash barriers - namely Armco.
The merican olling Mill Company was founded in 1900 in Middletown, Ohio, USA and pioneered the use of galvanised corrugated steel structures in civil engineering.
Armco was a major participant in the development of crash barriers in the US, where experimentation started in the 1920s, and after dynamic full scale tests in the late 1950s settled on promotion of Armco Flex - Beam guardrail.
Parker states that UK crash barriers 'came from a range of standard designs originally developed by the Department of Transport in the 1970s'.
This is not the case. Armco, introduced the DoT and highway engineers to ARMCO flex-beam guardrail in the late 1950s.
Frank W Thomson (M), Glenshira, Drummond Terrace, Crieff, Perthshire PH7 4AF