Fig. 2From: A systematic review of indicators to assess the sustainability of road infrastructure projectsThe resulting clusters and grouping of the examined papers [1, 7, 9,10,11, 16, 21, 24, 25, 36, 38,39,40, 42,43,44,45, 47, 48, 53, 55, 57, 60, 61, 66, 69, 71, 78, 79, 81, 84]Back to article page