General problems
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Poor quality and durability of in-situ trenches: Concrete produced on-site often does not fulfil highest quality standards compared to factory made products and so often fail after a short time (e.g. cracks in concrete or breakdown of system)
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No traffic-secure solution: Neither channel nor cover can be tested for requested loading capacity
 
      
      
      
    
    
    
    
    
    
    
