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Table 5 Final estimates of safety efficiency indices for rural road infrastructure improvements, received in the current study, and estimation of the number of accidents saved following the treatments
From: The evaluation of safety efficiency of non-urban infrastructure improvements; a case-study
Type of infrastructure improvement (#) | % of change in injury accidents | % of change in total accidents1 | Number of injury accidents annually saved | Number of total accidents1 annually saved |
|---|---|---|---|---|
Infrastructure improvements on road sections | ||||
Upgrading a single-carriageway to a dual-carriageway road (2) | --32 % | --31 % | 18.2 | 59.4 |
Building a median on a road section crossing an urban area (2) | -- | --53 % | -- | 26.0 |
Barrier installation - building a rigid median, on a single-carriageway road (4) | --50 % | --23 % | 11.9 | 14.1 |
A combined treatment: barriers, road marking/signing, on a single-carriageway road (4) | -- | --13 % | -- | 17.8 |
A combined treatment: barriers, road marking/signing, on a dual-carriageway road (3) | -- | --14 % | -- | 59.4 |
A combined treatment: resurfacing, road marking, barriers' treatment, on a single-carriageway road (6) | --16 % | -- | 15.7 | -- |
A combined treatment: resurfacing, road marking, barriers' treatment, on a dual-carriageway road (6) | --23 % | -- | 88.5 | -- |
A combined treatment: barrier treatments, resurfacing, shoulders, on a single-carriageway road (5) | --12 % | --19 % | 18.9 | 127.9 |
A combined treatment: resurfacing, crash cushion installation, barrier treatments, on a dual-carriageway road (1) * | -- | --17 % | -- | 104.1 |
Pavement treatments, road marking, raised pavement markers, on a single-carriageway road (1) * | -- | --23 % | -- | 18.0 |
Infrastructure improvements at junctions | ||||
Building a roundabout (9) | --52 % | -- | 10.2 | -- |
Traffic lights' installation (14) | --29 % | -- | 10.5 | -- |
Signing arrangement at a junction (4) * | -- | --36 % | -- | 14.5 |
Resurfacing, barrier treatments, at a signalized junction (7) | --20 % | −19 % | 8.9 | 40.5 |
Barrier treatments, at a signalized junction (9) | --28 % | −11 % | 15.3 | 25.4 |
Pavement treatments, at a signalized junction (2) * | −50 % | −25 % | 8.8 | 8.7 |
Infrastructure improvements on interchanges | ||||
Building roundabouts on the interchange (1) * | --72 % | -- | 2.6 | -- |
Barrier treatments (2) * | -- | −28 % | -- | 15.0 |
Ramps' resurfacing (4) * | --23 % | -- | 14.3 | -- |