Research Article
Nonparametric Binary Recursive Partitioning for Deterioration Prediction of Infrastructure Elements
Table 2
Indiana bridge inventory characteristics from the last inspection.
| Network assessment | Highway class | | | NHS | Major STP | Minor STP | Local |
| Average bridge age (year) | | 31 | 37 | 34 | 36 | Clear deck width distribution (%) | ≤ 12 ft | 1 | 2 | 4 | 29 | ≤ 13 ft | 3 | 3 | 3 | 16 | ≤ 14 ft | 4 | 4 | 5 | 16 | ≤ 15 ft | 6 | 7 | 3 | 3 | ≤ 16 ft | 6 | 5 | 7 | 14 | > 16 ft | 80 | 79 | 66 | 15 | Deck condition distribution (%) | Good | 70 | 65 | 69 | 63 | Satisfactory | 16 | 26 | 22 | 27 | Fair | 2 | 7 | 6 | 7 | Poor | 1.5 | 1.5 | 2 | 2 | Serious | 0.5 | 0.5 | 1 | 1 | Superstructure condition distribution (%) | Good | 85 | 74 | 74 | 81 | Satisfactory | 9 | 18 | 17 | 10 | Fair | 3 | 4 | 4 | 5 | Poor | 2.5 | 3 | 3 | 2 | Serious | 0.5 | 1 | 2 | 2 | Substructure condition distribution (%) | Good | 85 | 71 | 68 | 80 | Satisfactory | 8 | 21 | 21 | 11 | Fair | 5 | 6 | 8 | 5 | Poor | 1.5 | 1 | 2 | 2 | Serious | 0.5 | 1 | 1 | 2 | Inventory load rating distribution (%) | IR ≤5 tons | 0.2 | 0.2 | 0.2 | 1.5 | 5 < IR ≤15 tons | 0.2 | 0.2 | 0.2 | 1.5 | 15 < IR ≤25 tons | 3.6 | 5 | 7.6 | 8 | 25 < IR ≤30 tons | 11 | 14 | 12 | 5 | 30 < IR ≤35 tons | 19 | 19.6 | 18 | 16 | 35 < IR ≤40 tons | 45 | 44 | 47 | 42 | IR >40 tons | 21 | 17 | 15 | 26 |
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