Cracks were discovered Monday in the base of the Bridge of Strings, at the entrance to Jerusalem. Army Radio reported faults in the welding of several of the iron bars which would likely lead to delays in the project and an increase in its cost. The municipality denies these claims. The construction of the grandiose new bridge is part of the city's long-planned light rail system. The state-of-the-art structure is being built at the central junction connecting Jaffa Road and Sderot Herzl at the entrance to the city. The bridge, designed by the renowned Spanish architect Santiago Calatrava, is being built on concrete supports covered in Jerusalem stone, with the steel-and-glass structure hanging above it. Along the track of the bridge - which will connect the light rail's first city route from Jaffa Road to Sderot Herzl in both directions - a pedestrian walkway will offer visitors and commuters a panoramic view of the city. The annual report at the end of 2007 by Jerusalem Comptroller Shlomit Rubin revealed that construction of the bridge was already costing more than three times its original budget, while the building project was running about four years behind schedule.