Before revision: The following table compares the features of utility networks in single purpose buried trenches vs. the features of common ducts or tunnels: Utility TunnelsDirect BurialHigher initial capital cost for construction of tunnelsCheaper initial capital cost of burying individual infrastructureEasy location of infrastructureDifficult location of infrastructureFast maintenance replacementSlow maintenance and replacementLess roadworks and trafficIncreased roadworks and trafficNo manholes on roads.
After revision: The following table compares the features of utility networks in single purpose buried trenches vs. the features of common ducts or tunnels: Utility tunnels Direct burialHigherand initial capital cost for construction of tunnelsCheaper initial capital cost of burying individual infrastructureEasy location of infrastructureDifficult location of infrastructureFast maintenance replacementSlow maintenance and replacementLess roadworks and trafficIncreased roadworks and trafficNo manholes on roads.