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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 --
  1. Notes: 1 Injury accidents + "general with casualties" accidents;# number of sites treated
  2. * Further monitoring is required. "--" value is not available