Figure 2.
The chart displays scattered data points across four categories: rails, hospitals, tunnels, and roads. Rails shows values around 10, 30, and 45. Hospitals show points near 10, 25, and about 40. Tunnels show a low value near 5, a mid value near 45, and a high value near 170. Roads show values near negative 25, 5, and about 30. Larger outlined markers indicate central values near 45 for rails, about 40 for hospitals, about 47 for tunnels, and about 30 for roads.Case comparison to typical mean cost overruns. The larger black circle represents the typical mean cost overrun by Flyvbjerg and Gardner (2023)
Source: Authors’ own work