A Guardrail is a fence or similar structure designed to prevent vehicles from veering off the roadway into oncoming traffic, crashing against solid objects or falling over an embankment. A secondary objective is keeping the vehicle upright while deflected along the guardrail.
Photo: Armco Barriers
The useful life of a guradrail will vary considerably due to a range of environmental & other factors. A useful life of 20 years appears to be typical for the runways operated by the organisations listed below.
Please feel free to improve the table by adding your Council or organisation's information.