Prefabricated concrete passages, which are a kind of channel for the passage of cables and pipes, instead of direct burial of pipes and underground cables, are used and protect them against external factors such as damage or bad weather, while allowing access to Provides maintenance facilities. The time and cost of installing them is also lower.

Initially, these canals were covered only with metal or concrete, which, despite the high load-bearing capacity, were cracked, corroded and cracked over time. With the development of composite coatings (GRP) and the collaboration of the manufacturers of these coatings with builders of prefabricated bridges, composites and composites were created. The Fibrelite company, which operates in this field, has made a coating that is securely portable by two people, while a concrete coating will weigh about 400 kilograms.