1. 
   Guard Rail
   A protective rail fixed to a working platform whose purpose is to prevent persons falling.
   Found op http://www.encyclo.co.uk/local/20474
   
   
2. 
   Guard rail
   Guard rail or guardrail, sometimes referred to as guide rail or railing, is a system designed to keep people or vehicles from (in most cases unintentionally) straying into dangerous or off-limits areas. A handrail is less restrictive than a guard rail and provides both support and the protective li...
   Found op http://en.wikipedia.org/wiki/Guard_rail
   
   
3. 
   guard rail
   see Vangrail method
   Found op http://budhouston.wordpress.com/a-glossary-of-dog-agility-terms/
   
   
4. 
   guardrail
   1) Bridge part 2) Highway barrier 3) Rail 4) Railing 5) Safety rail
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/guardrail/1
   
   

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