| Input variables | References |
| Project type | [12, 54] | Project complexity | [7, 10] | Project location | [10ā12, 21, 28, 33, 54, 58] | Project scope | [7, 11, 12, 26, 54] | Project size | [8, 11, 12, 21, 26, 54] | Site topography | [12, 21, 25, 56, 59] | Bridge type | [21, 23] | Number of bridges | [12, 21, 23] | Existence of groundwater | [12] | Soil type | [12, 26, 56, 60] | Inflation rate | [11, 12, 54] | Project duration | [7, 10, 12, 21, 26] |
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